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Finding the Fourth Proportional to 108.42, 149.70 and 71.64

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Solution

The fourth proportional to 108.42, 149.70 and 71.64 is: 98.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.42 : 149.70 = 71.64 : x
  2. Step 2: Convert to fraction form
    108.42/149.70 = 71.64/x
  3. Step 3: Cross multiply
    108.42x = 149.70 × 71.64
  4. Step 4: Simplify right side
    108.42x = 10,724.51
  5. Step 5: Solve for x
    x = 10,724.51/108.42
  6. Step 6: Final answer
    x = 98.92

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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.