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Finding the Fourth Proportional to 75.36, 112.49 and 69.87

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Solution

The fourth proportional to 75.36, 112.49 and 69.87 is: 104.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.36 : 112.49 = 69.87 : x
  2. Step 2: Convert to fraction form
    75.36/112.49 = 69.87/x
  3. Step 3: Cross multiply
    75.36x = 112.49 × 69.87
  4. Step 4: Simplify right side
    75.36x = 7,859.11
  5. Step 5: Solve for x
    x = 7,859.11/75.36
  6. Step 6: Final answer
    x = 104.29

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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.