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Finding the Fourth Proportional to 767.40, 1,149.21 and 630.78

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Solution

The fourth proportional to 767.40, 1,149.21 and 630.78 is: 944.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    767.40 : 1,149.21 = 630.78 : x
  2. Step 2: Convert to fraction form
    767.40/1,149.21 = 630.78/x
  3. Step 3: Cross multiply
    767.40x = 1,149.21 × 630.78
  4. Step 4: Simplify right side
    767.40x = 724,898.68
  5. Step 5: Solve for x
    x = 724,898.68/767.40
  6. Step 6: Final answer
    x = 944.62

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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.