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Finding the Fourth Proportional to 981.89, 1,354.98 and 632.78

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Solution

The fourth proportional to 981.89, 1,354.98 and 632.78 is: 873.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.89 : 1,354.98 = 632.78 : x
  2. Step 2: Convert to fraction form
    981.89/1,354.98 = 632.78/x
  3. Step 3: Cross multiply
    981.89x = 1,354.98 × 632.78
  4. Step 4: Simplify right side
    981.89x = 857,404.24
  5. Step 5: Solve for x
    x = 857,404.24/981.89
  6. Step 6: Final answer
    x = 873.22

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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.