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Finding the Fourth Proportional to 710.97, 981.21 and 631.65

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Solution

The fourth proportional to 710.97, 981.21 and 631.65 is: 871.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    710.97 : 981.21 = 631.65 : x
  2. Step 2: Convert to fraction form
    710.97/981.21 = 631.65/x
  3. Step 3: Cross multiply
    710.97x = 981.21 × 631.65
  4. Step 4: Simplify right side
    710.97x = 619,781.30
  5. Step 5: Solve for x
    x = 619,781.30/710.97
  6. Step 6: Final answer
    x = 871.74

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.