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Finding the Fourth Proportional to 78.97, 109.10 and 67.43

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Solution

The fourth proportional to 78.97, 109.10 and 67.43 is: 93.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    78.97 : 109.10 = 67.43 : x
  2. Step 2: Convert to fraction form
    78.97/109.10 = 67.43/x
  3. Step 3: Cross multiply
    78.97x = 109.10 × 67.43
  4. Step 4: Simplify right side
    78.97x = 7,356.61
  5. Step 5: Solve for x
    x = 7,356.61/78.97
  6. Step 6: Final answer
    x = 93.16

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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.