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Finding the Fourth Proportional to 86.57, 119.46 and 65.86

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Solution

The fourth proportional to 86.57, 119.46 and 65.86 is: 90.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.57 : 119.46 = 65.86 : x
  2. Step 2: Convert to fraction form
    86.57/119.46 = 65.86/x
  3. Step 3: Cross multiply
    86.57x = 119.46 × 65.86
  4. Step 4: Simplify right side
    86.57x = 7,866.71
  5. Step 5: Solve for x
    x = 7,866.71/86.57
  6. Step 6: Final answer
    x = 90.88

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.