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Finding the Fourth Proportional to 75.13, 112.66 and 31.79

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Solution

The fourth proportional to 75.13, 112.66 and 31.79 is: 47.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.13 : 112.66 = 31.79 : x
  2. Step 2: Convert to fraction form
    75.13/112.66 = 31.79/x
  3. Step 3: Cross multiply
    75.13x = 112.66 × 31.79
  4. Step 4: Simplify right side
    75.13x = 3,581.66
  5. Step 5: Solve for x
    x = 3,581.66/75.13
  6. Step 6: Final answer
    x = 47.67

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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.