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Finding the Fourth Proportional to 20,572.76, 30,859.14 and 4,990.25

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Solution

The fourth proportional to 20,572.76, 30,859.14 and 4,990.25 is: 7,485.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,572.76 : 30,859.14 = 4,990.25 : x
  2. Step 2: Convert to fraction form
    20,572.76/30,859.14 = 4,990.25/x
  3. Step 3: Cross multiply
    20,572.76x = 30,859.14 × 4,990.25
  4. Step 4: Simplify right side
    20,572.76x = 153,994,823.39
  5. Step 5: Solve for x
    x = 153,994,823.39/20,572.76
  6. Step 6: Final answer
    x = 7,485.38

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.