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Finding the Fourth Proportional to 938.97, 1,407.15 and 438.03

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Solution

The fourth proportional to 938.97, 1,407.15 and 438.03 is: 656.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.97 : 1,407.15 = 438.03 : x
  2. Step 2: Convert to fraction form
    938.97/1,407.15 = 438.03/x
  3. Step 3: Cross multiply
    938.97x = 1,407.15 × 438.03
  4. Step 4: Simplify right side
    938.97x = 616,373.91
  5. Step 5: Solve for x
    x = 616,373.91/938.97
  6. Step 6: Final answer
    x = 656.44

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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.