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Finding the Fourth Proportional to 1,139.58, 1,572.65 and 691.47

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Solution

The fourth proportional to 1,139.58, 1,572.65 and 691.47 is: 954.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,139.58 : 1,572.65 = 691.47 : x
  2. Step 2: Convert to fraction form
    1,139.58/1,572.65 = 691.47/x
  3. Step 3: Cross multiply
    1,139.58x = 1,572.65 × 691.47
  4. Step 4: Simplify right side
    1,139.58x = 1,087,440.30
  5. Step 5: Solve for x
    x = 1,087,440.30/1,139.58
  6. Step 6: Final answer
    x = 954.25

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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.