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Finding the Fourth Proportional to 75.27, 112.30 and 69.76

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Solution

The fourth proportional to 75.27, 112.30 and 69.76 is: 104.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.27 : 112.30 = 69.76 : x
  2. Step 2: Convert to fraction form
    75.27/112.30 = 69.76/x
  3. Step 3: Cross multiply
    75.27x = 112.30 × 69.76
  4. Step 4: Simplify right side
    75.27x = 7,834.05
  5. Step 5: Solve for x
    x = 7,834.05/75.27
  6. Step 6: Final answer
    x = 104.08

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.