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Finding the Fourth Proportional to 108.08, 149.28 and 78.92

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Solution

The fourth proportional to 108.08, 149.28 and 78.92 is: 109.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.08 : 149.28 = 78.92 : x
  2. Step 2: Convert to fraction form
    108.08/149.28 = 78.92/x
  3. Step 3: Cross multiply
    108.08x = 149.28 × 78.92
  4. Step 4: Simplify right side
    108.08x = 11,781.18
  5. Step 5: Solve for x
    x = 11,781.18/108.08
  6. Step 6: Final answer
    x = 109.00

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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.