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Finding the Fourth Proportional to 20,490.76, 28,277.90 and 11,993.73

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Solution

The fourth proportional to 20,490.76, 28,277.90 and 11,993.73 is: 16,551.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,490.76 : 28,277.90 = 11,993.73 : x
  2. Step 2: Convert to fraction form
    20,490.76/28,277.90 = 11,993.73/x
  3. Step 3: Cross multiply
    20,490.76x = 28,277.90 × 11,993.73
  4. Step 4: Simplify right side
    20,490.76x = 339,157,497.57
  5. Step 5: Solve for x
    x = 339,157,497.57/20,490.76
  6. Step 6: Final answer
    x = 16,551.73

Related Problems

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Half scale
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Double scale
Find fourth proportional to 20,491.76, 28,279.28 and 11,994.73
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.