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Finding the Fourth Proportional to 415.75, 623.45 and 141.86

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Solution

The fourth proportional to 415.75, 623.45 and 141.86 is: 212.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    415.75 : 623.45 = 141.86 : x
  2. Step 2: Convert to fraction form
    415.75/623.45 = 141.86/x
  3. Step 3: Cross multiply
    415.75x = 623.45 × 141.86
  4. Step 4: Simplify right side
    415.75x = 88,445.21
  5. Step 5: Solve for x
    x = 88,445.21/415.75
  6. Step 6: Final answer
    x = 212.74

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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.