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Finding the Fourth Proportional to 931.88, 1,397.87 and 671.16

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Solution

The fourth proportional to 931.88, 1,397.87 and 671.16 is: 1,006.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.88 : 1,397.87 = 671.16 : x
  2. Step 2: Convert to fraction form
    931.88/1,397.87 = 671.16/x
  3. Step 3: Cross multiply
    931.88x = 1,397.87 × 671.16
  4. Step 4: Simplify right side
    931.88x = 938,194.43
  5. Step 5: Solve for x
    x = 938,194.43/931.88
  6. Step 6: Final answer
    x = 1,006.78

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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.