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Finding the Fourth Proportional to 938.14, 1,407.57 and 660.76

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Solution

The fourth proportional to 938.14, 1,407.57 and 660.76 is: 991.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.14 : 1,407.57 = 660.76 : x
  2. Step 2: Convert to fraction form
    938.14/1,407.57 = 660.76/x
  3. Step 3: Cross multiply
    938.14x = 1,407.57 × 660.76
  4. Step 4: Simplify right side
    938.14x = 930,065.95
  5. Step 5: Solve for x
    x = 930,065.95/938.14
  6. Step 6: Final answer
    x = 991.39

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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.