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Finding the Fourth Proportional to 931.97, 1,397.96 and 870.47

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Solution

The fourth proportional to 931.97, 1,397.96 and 870.47 is: 1,305.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.97 : 1,397.96 = 870.47 : x
  2. Step 2: Convert to fraction form
    931.97/1,397.96 = 870.47/x
  3. Step 3: Cross multiply
    931.97x = 1,397.96 × 870.47
  4. Step 4: Simplify right side
    931.97x = 1,216,877.43
  5. Step 5: Solve for x
    x = 1,216,877.43/931.97
  6. Step 6: Final answer
    x = 1,305.70

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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.