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Finding the Fourth Proportional to 78.74, 108.66 and 54.17

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Solution

The fourth proportional to 78.74, 108.66 and 54.17 is: 74.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    78.74 : 108.66 = 54.17 : x
  2. Step 2: Convert to fraction form
    78.74/108.66 = 54.17/x
  3. Step 3: Cross multiply
    78.74x = 108.66 × 54.17
  4. Step 4: Simplify right side
    78.74x = 5,885.30
  5. Step 5: Solve for x
    x = 5,885.30/78.74
  6. Step 6: Final answer
    x = 74.75

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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.