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Finding the Fourth Proportional to 86.49, 129.85 and 48.11

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Solution

The fourth proportional to 86.49, 129.85 and 48.11 is: 72.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.49 : 129.85 = 48.11 : x
  2. Step 2: Convert to fraction form
    86.49/129.85 = 48.11/x
  3. Step 3: Cross multiply
    86.49x = 129.85 × 48.11
  4. Step 4: Simplify right side
    86.49x = 6,247.08
  5. Step 5: Solve for x
    x = 6,247.08/86.49
  6. Step 6: Final answer
    x = 72.23

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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.