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Finding the Fourth Proportional to 415.90, 623.92 and 142.18

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Solution

The fourth proportional to 415.90, 623.92 and 142.18 is: 213.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    415.90 : 623.92 = 142.18 : x
  2. Step 2: Convert to fraction form
    415.90/623.92 = 142.18/x
  3. Step 3: Cross multiply
    415.90x = 623.92 × 142.18
  4. Step 4: Simplify right side
    415.90x = 88,708.95
  5. Step 5: Solve for x
    x = 88,708.95/415.90
  6. Step 6: Final answer
    x = 213.29

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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.