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Finding the Fourth Proportional to 108.81, 150.12 and 65.16

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Solution

The fourth proportional to 108.81, 150.12 and 65.16 is: 89.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.81 : 150.12 = 65.16 : x
  2. Step 2: Convert to fraction form
    108.81/150.12 = 65.16/x
  3. Step 3: Cross multiply
    108.81x = 150.12 × 65.16
  4. Step 4: Simplify right side
    108.81x = 9,781.82
  5. Step 5: Solve for x
    x = 9,781.82/108.81
  6. Step 6: Final answer
    x = 89.90

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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.