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Finding the Fourth Proportional to 108.43, 149.63 and 61.80

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Solution

The fourth proportional to 108.43, 149.63 and 61.80 is: 85.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.43 : 149.63 = 61.80 : x
  2. Step 2: Convert to fraction form
    108.43/149.63 = 61.80/x
  3. Step 3: Cross multiply
    108.43x = 149.63 × 61.80
  4. Step 4: Simplify right side
    108.43x = 9,246.61
  5. Step 5: Solve for x
    x = 9,246.61/108.43
  6. Step 6: Final answer
    x = 85.28

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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.