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Finding the Fourth Proportional to 75.12, 112.38 and 57.12

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Solution

The fourth proportional to 75.12, 112.38 and 57.12 is: 85.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.12 : 112.38 = 57.12 : x
  2. Step 2: Convert to fraction form
    75.12/112.38 = 57.12/x
  3. Step 3: Cross multiply
    75.12x = 112.38 × 57.12
  4. Step 4: Simplify right side
    75.12x = 6,419.15
  5. Step 5: Solve for x
    x = 6,419.15/75.12
  6. Step 6: Final answer
    x = 85.45

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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.