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Finding the Fourth Proportional to 981.12, 1,472.16 and 634.96

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Solution

The fourth proportional to 981.12, 1,472.16 and 634.96 is: 952.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.12 : 1,472.16 = 634.96 : x
  2. Step 2: Convert to fraction form
    981.12/1,472.16 = 634.96/x
  3. Step 3: Cross multiply
    981.12x = 1,472.16 × 634.96
  4. Step 4: Simplify right side
    981.12x = 934,762.71
  5. Step 5: Solve for x
    x = 934,762.71/981.12
  6. Step 6: Final answer
    x = 952.75

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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.