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Finding the Fourth Proportional to 415.11, 572.90 and 257.70

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Solution

The fourth proportional to 415.11, 572.90 and 257.70 is: 355.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    415.11 : 572.90 = 257.70 : x
  2. Step 2: Convert to fraction form
    415.11/572.90 = 257.70/x
  3. Step 3: Cross multiply
    415.11x = 572.90 × 257.70
  4. Step 4: Simplify right side
    415.11x = 147,636.33
  5. Step 5: Solve for x
    x = 147,636.33/415.11
  6. Step 6: Final answer
    x = 355.66

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.