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Finding the Fourth Proportional to 75.21, 112.76 and 42.73

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Solution

The fourth proportional to 75.21, 112.76 and 42.73 is: 64.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.21 : 112.76 = 42.73 : x
  2. Step 2: Convert to fraction form
    75.21/112.76 = 42.73/x
  3. Step 3: Cross multiply
    75.21x = 112.76 × 42.73
  4. Step 4: Simplify right side
    75.21x = 4,818.23
  5. Step 5: Solve for x
    x = 4,818.23/75.21
  6. Step 6: Final answer
    x = 64.06

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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.