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Finding the Fourth Proportional to 86.33, 129.53 and 47.76

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Solution

The fourth proportional to 86.33, 129.53 and 47.76 is: 71.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.33 : 129.53 = 47.76 : x
  2. Step 2: Convert to fraction form
    86.33/129.53 = 47.76/x
  3. Step 3: Cross multiply
    86.33x = 129.53 × 47.76
  4. Step 4: Simplify right side
    86.33x = 6,186.11
  5. Step 5: Solve for x
    x = 6,186.11/86.33
  6. Step 6: Final answer
    x = 71.66

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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.