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Finding the Fourth Proportional to 1,139.53, 1,572.85 and 742.19

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Solution

The fourth proportional to 1,139.53, 1,572.85 and 742.19 is: 1,024.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,139.53 : 1,572.85 = 742.19 : x
  2. Step 2: Convert to fraction form
    1,139.53/1,572.85 = 742.19/x
  3. Step 3: Cross multiply
    1,139.53x = 1,572.85 × 742.19
  4. Step 4: Simplify right side
    1,139.53x = 1,167,353.54
  5. Step 5: Solve for x
    x = 1,167,353.54/1,139.53
  6. Step 6: Final answer
    x = 1,024.42

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Half scale
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Double scale
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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.