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Finding the Fourth Proportional to 86.65, 129.84 and 46.11

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Solution

The fourth proportional to 86.65, 129.84 and 46.11 is: 69.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.65 : 129.84 = 46.11 : x
  2. Step 2: Convert to fraction form
    86.65/129.84 = 46.11/x
  3. Step 3: Cross multiply
    86.65x = 129.84 × 46.11
  4. Step 4: Simplify right side
    86.65x = 5,986.92
  5. Step 5: Solve for x
    x = 5,986.92/86.65
  6. Step 6: Final answer
    x = 69.09

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.