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Finding the Fourth Proportional to 87.41, 120.66 and 78.30

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Solution

The fourth proportional to 87.41, 120.66 and 78.30 is: 108.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.41 : 120.66 = 78.30 : x
  2. Step 2: Convert to fraction form
    87.41/120.66 = 78.30/x
  3. Step 3: Cross multiply
    87.41x = 120.66 × 78.30
  4. Step 4: Simplify right side
    87.41x = 9,447.68
  5. Step 5: Solve for x
    x = 9,447.68/87.41
  6. Step 6: Final answer
    x = 108.08

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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.