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Finding the Fourth Proportional to 515.20, 772.62 and 149.89

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Solution

The fourth proportional to 515.20, 772.62 and 149.89 is: 224.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.20 : 772.62 = 149.89 : x
  2. Step 2: Convert to fraction form
    515.20/772.62 = 149.89/x
  3. Step 3: Cross multiply
    515.20x = 772.62 × 149.89
  4. Step 4: Simplify right side
    515.20x = 115,808.01
  5. Step 5: Solve for x
    x = 115,808.01/515.20
  6. Step 6: Final answer
    x = 224.78

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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.