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Finding the Fourth Proportional to 1,129.70, 1,694.55 and 742.15

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Solution

The fourth proportional to 1,129.70, 1,694.55 and 742.15 is: 1,113.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.70 : 1,694.55 = 742.15 : x
  2. Step 2: Convert to fraction form
    1,129.70/1,694.55 = 742.15/x
  3. Step 3: Cross multiply
    1,129.70x = 1,694.55 × 742.15
  4. Step 4: Simplify right side
    1,129.70x = 1,257,610.28
  5. Step 5: Solve for x
    x = 1,257,610.28/1,129.70
  6. Step 6: Final answer
    x = 1,113.23

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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.