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Finding the Fourth Proportional to 75.48, 113.07 and 68.64

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Solution

The fourth proportional to 75.48, 113.07 and 68.64 is: 102.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.48 : 113.07 = 68.64 : x
  2. Step 2: Convert to fraction form
    75.48/113.07 = 68.64/x
  3. Step 3: Cross multiply
    75.48x = 113.07 × 68.64
  4. Step 4: Simplify right side
    75.48x = 7,761.12
  5. Step 5: Solve for x
    x = 7,761.12/75.48
  6. Step 6: Final answer
    x = 102.82

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.