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Finding the Fourth Proportional to 75.68, 113.28 and 45.16

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Solution

The fourth proportional to 75.68, 113.28 and 45.16 is: 67.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.68 : 113.28 = 45.16 : x
  2. Step 2: Convert to fraction form
    75.68/113.28 = 45.16/x
  3. Step 3: Cross multiply
    75.68x = 113.28 × 45.16
  4. Step 4: Simplify right side
    75.68x = 5,115.72
  5. Step 5: Solve for x
    x = 5,115.72/75.68
  6. Step 6: Final answer
    x = 67.60

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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.