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Finding the Fourth Proportional to 415.06, 625.05 and 387.72

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Solution

The fourth proportional to 415.06, 625.05 and 387.72 is: 583.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    415.06 : 625.05 = 387.72 : x
  2. Step 2: Convert to fraction form
    415.06/625.05 = 387.72/x
  3. Step 3: Cross multiply
    415.06x = 625.05 × 387.72
  4. Step 4: Simplify right side
    415.06x = 242,344.39
  5. Step 5: Solve for x
    x = 242,344.39/415.06
  6. Step 6: Final answer
    x = 583.88

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.