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Finding the Fourth Proportional to 515.88, 775.08 and 424.68

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Solution

The fourth proportional to 515.88, 775.08 and 424.68 is: 638.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.88 : 775.08 = 424.68 : x
  2. Step 2: Convert to fraction form
    515.88/775.08 = 424.68/x
  3. Step 3: Cross multiply
    515.88x = 775.08 × 424.68
  4. Step 4: Simplify right side
    515.88x = 329,160.97
  5. Step 5: Solve for x
    x = 329,160.97/515.88
  6. Step 6: Final answer
    x = 638.06

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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.