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Finding the Fourth Proportional to 738.92, 1,107.42 and 642.28

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Solution

The fourth proportional to 738.92, 1,107.42 and 642.28 is: 962.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    738.92 : 1,107.42 = 642.28 : x
  2. Step 2: Convert to fraction form
    738.92/1,107.42 = 642.28/x
  3. Step 3: Cross multiply
    738.92x = 1,107.42 × 642.28
  4. Step 4: Simplify right side
    738.92x = 711,273.72
  5. Step 5: Solve for x
    x = 711,273.72/738.92
  6. Step 6: Final answer
    x = 962.59

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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.