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Finding the Fourth Proportional to 108.29, 149.40 and 61.64

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Solution

The fourth proportional to 108.29, 149.40 and 61.64 is: 85.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.29 : 149.40 = 61.64 : x
  2. Step 2: Convert to fraction form
    108.29/149.40 = 61.64/x
  3. Step 3: Cross multiply
    108.29x = 149.40 × 61.64
  4. Step 4: Simplify right side
    108.29x = 9,209.02
  5. Step 5: Solve for x
    x = 9,209.02/108.29
  6. Step 6: Final answer
    x = 85.04

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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.