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Finding the Fourth Proportional to 1,117.31, 1,542.17 and 675.55

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Solution

The fourth proportional to 1,117.31, 1,542.17 and 675.55 is: 932.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,117.31 : 1,542.17 = 675.55 : x
  2. Step 2: Convert to fraction form
    1,117.31/1,542.17 = 675.55/x
  3. Step 3: Cross multiply
    1,117.31x = 1,542.17 × 675.55
  4. Step 4: Simplify right side
    1,117.31x = 1,041,816.56
  5. Step 5: Solve for x
    x = 1,041,816.56/1,117.31
  6. Step 6: Final answer
    x = 932.44

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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.