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Finding the Fourth Proportional to 86.81, 119.67 and 62.20

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Solution

The fourth proportional to 86.81, 119.67 and 62.20 is: 85.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.81 : 119.67 = 62.20 : x
  2. Step 2: Convert to fraction form
    86.81/119.67 = 62.20/x
  3. Step 3: Cross multiply
    86.81x = 119.67 × 62.20
  4. Step 4: Simplify right side
    86.81x = 7,443.63
  5. Step 5: Solve for x
    x = 7,443.63/86.81
  6. Step 6: Final answer
    x = 85.75

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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.