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Finding the Fourth Proportional to 75.48, 113.86 and 74.70

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Solution

The fourth proportional to 75.48, 113.86 and 74.70 is: 112.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.48 : 113.86 = 74.70 : x
  2. Step 2: Convert to fraction form
    75.48/113.86 = 74.70/x
  3. Step 3: Cross multiply
    75.48x = 113.86 × 74.70
  4. Step 4: Simplify right side
    75.48x = 8,505.34
  5. Step 5: Solve for x
    x = 8,505.34/75.48
  6. Step 6: Final answer
    x = 112.68

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.