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Finding the Fourth Proportional to 75.62, 104.18 and 57.18

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Solution

The fourth proportional to 75.62, 104.18 and 57.18 is: 78.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.62 : 104.18 = 57.18 : x
  2. Step 2: Convert to fraction form
    75.62/104.18 = 57.18/x
  3. Step 3: Cross multiply
    75.62x = 104.18 × 57.18
  4. Step 4: Simplify right side
    75.62x = 5,957.01
  5. Step 5: Solve for x
    x = 5,957.01/75.62
  6. Step 6: Final answer
    x = 78.78

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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.