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Finding the Fourth Proportional to 75.39, 104.05 and 42.64

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Solution

The fourth proportional to 75.39, 104.05 and 42.64 is: 58.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.39 : 104.05 = 42.64 : x
  2. Step 2: Convert to fraction form
    75.39/104.05 = 42.64/x
  3. Step 3: Cross multiply
    75.39x = 104.05 × 42.64
  4. Step 4: Simplify right side
    75.39x = 4,436.83
  5. Step 5: Solve for x
    x = 4,436.83/75.39
  6. Step 6: Final answer
    x = 58.85

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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.