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Finding the Fourth Proportional to 75.47, 113.72 and 69.57

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Solution

The fourth proportional to 75.47, 113.72 and 69.57 is: 104.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.47 : 113.72 = 69.57 : x
  2. Step 2: Convert to fraction form
    75.47/113.72 = 69.57/x
  3. Step 3: Cross multiply
    75.47x = 113.72 × 69.57
  4. Step 4: Simplify right side
    75.47x = 7,911.15
  5. Step 5: Solve for x
    x = 7,911.15/75.47
  6. Step 6: Final answer
    x = 104.83

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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.