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Finding the Fourth Proportional to 61.62, 85.12 and 49.43

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Solution

The fourth proportional to 61.62, 85.12 and 49.43 is: 68.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.62 : 85.12 = 49.43 : x
  2. Step 2: Convert to fraction form
    61.62/85.12 = 49.43/x
  3. Step 3: Cross multiply
    61.62x = 85.12 × 49.43
  4. Step 4: Simplify right side
    61.62x = 4,207.48
  5. Step 5: Solve for x
    x = 4,207.48/61.62
  6. Step 6: Final answer
    x = 68.28

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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.