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Finding the Fourth Proportional to 1,139.66, 1,708.28 and 814.04

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Solution

The fourth proportional to 1,139.66, 1,708.28 and 814.04 is: 1,220.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,139.66 : 1,708.28 = 814.04 : x
  2. Step 2: Convert to fraction form
    1,139.66/1,708.28 = 814.04/x
  3. Step 3: Cross multiply
    1,139.66x = 1,708.28 × 814.04
  4. Step 4: Simplify right side
    1,139.66x = 1,390,605.10
  5. Step 5: Solve for x
    x = 1,390,605.10/1,139.66
  6. Step 6: Final answer
    x = 1,220.19

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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.