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Finding the Fourth Proportional to 981.80, 1,354.56 and 632.72

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Solution

The fourth proportional to 981.80, 1,354.56 and 632.72 is: 872.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.80 : 1,354.56 = 632.72 : x
  2. Step 2: Convert to fraction form
    981.80/1,354.56 = 632.72/x
  3. Step 3: Cross multiply
    981.80x = 1,354.56 × 632.72
  4. Step 4: Simplify right side
    981.80x = 857,057.20
  5. Step 5: Solve for x
    x = 857,057.20/981.80
  6. Step 6: Final answer
    x = 872.94

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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.