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Finding the Fourth Proportional to 75.28, 112.43 and 71.14

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Solution

The fourth proportional to 75.28, 112.43 and 71.14 is: 106.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.28 : 112.43 = 71.14 : x
  2. Step 2: Convert to fraction form
    75.28/112.43 = 71.14/x
  3. Step 3: Cross multiply
    75.28x = 112.43 × 71.14
  4. Step 4: Simplify right side
    75.28x = 7,998.27
  5. Step 5: Solve for x
    x = 7,998.27/75.28
  6. Step 6: Final answer
    x = 106.25

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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.