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Finding the Fourth Proportional to 75.22, 112.81 and 31.87

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Solution

The fourth proportional to 75.22, 112.81 and 31.87 is: 47.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.22 : 112.81 = 31.87 : x
  2. Step 2: Convert to fraction form
    75.22/112.81 = 31.87/x
  3. Step 3: Cross multiply
    75.22x = 112.81 × 31.87
  4. Step 4: Simplify right side
    75.22x = 3,595.25
  5. Step 5: Solve for x
    x = 3,595.25/75.22
  6. Step 6: Final answer
    x = 47.80

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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.