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Finding the Fourth Proportional to 762.60, 1,138.68 and 616.80

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Solution

The fourth proportional to 762.60, 1,138.68 and 616.80 is: 920.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    762.60 : 1,138.68 = 616.80 : x
  2. Step 2: Convert to fraction form
    762.60/1,138.68 = 616.80/x
  3. Step 3: Cross multiply
    762.60x = 1,138.68 × 616.80
  4. Step 4: Simplify right side
    762.60x = 702,337.82
  5. Step 5: Solve for x
    x = 702,337.82/762.60
  6. Step 6: Final answer
    x = 920.98

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.