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Finding the Fourth Proportional to 108.32, 149.45 and 64.64

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Solution

The fourth proportional to 108.32, 149.45 and 64.64 is: 89.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.32 : 149.45 = 64.64 : x
  2. Step 2: Convert to fraction form
    108.32/149.45 = 64.64/x
  3. Step 3: Cross multiply
    108.32x = 149.45 × 64.64
  4. Step 4: Simplify right side
    108.32x = 9,659.38
  5. Step 5: Solve for x
    x = 9,659.38/108.32
  6. Step 6: Final answer
    x = 89.18

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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.