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Finding the Fourth Proportional to 28,012.76, 42,019.10 and 13,011.68

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Solution

The fourth proportional to 28,012.76, 42,019.10 and 13,011.68 is: 19,517.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,012.76 : 42,019.10 = 13,011.68 : x
  2. Step 2: Convert to fraction form
    28,012.76/42,019.10 = 13,011.68/x
  3. Step 3: Cross multiply
    28,012.76x = 42,019.10 × 13,011.68
  4. Step 4: Simplify right side
    28,012.76x = 546,739,083.09
  5. Step 5: Solve for x
    x = 546,739,083.09/28,012.76
  6. Step 6: Final answer
    x = 19,517.50

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Half scale
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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.