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Finding the Fourth Proportional to 87.30, 119.87 and 70.80

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Solution

The fourth proportional to 87.30, 119.87 and 70.80 is: 97.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.30 : 119.87 = 70.80 : x
  2. Step 2: Convert to fraction form
    87.30/119.87 = 70.80/x
  3. Step 3: Cross multiply
    87.30x = 119.87 × 70.80
  4. Step 4: Simplify right side
    87.30x = 8,486.44
  5. Step 5: Solve for x
    x = 8,486.44/87.30
  6. Step 6: Final answer
    x = 97.21

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.