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Finding the Fourth Proportional to 981.25, 1,354.13 and 631.95

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Solution

The fourth proportional to 981.25, 1,354.13 and 631.95 is: 872.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.25 : 1,354.13 = 631.95 : x
  2. Step 2: Convert to fraction form
    981.25/1,354.13 = 631.95/x
  3. Step 3: Cross multiply
    981.25x = 1,354.13 × 631.95
  4. Step 4: Simplify right side
    981.25x = 855,742.45
  5. Step 5: Solve for x
    x = 855,742.45/981.25
  6. Step 6: Final answer
    x = 872.09

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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.