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Finding the Fourth Proportional to 86.61, 119.44 and 57.13

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Solution

The fourth proportional to 86.61, 119.44 and 57.13 is: 78.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.61 : 119.44 = 57.13 : x
  2. Step 2: Convert to fraction form
    86.61/119.44 = 57.13/x
  3. Step 3: Cross multiply
    86.61x = 119.44 × 57.13
  4. Step 4: Simplify right side
    86.61x = 6,823.38
  5. Step 5: Solve for x
    x = 6,823.38/86.61
  6. Step 6: Final answer
    x = 78.78

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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.