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Finding the Fourth Proportional to 87.23, 131.43 and 72.34

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Solution

The fourth proportional to 87.23, 131.43 and 72.34 is: 109.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.23 : 131.43 = 72.34 : x
  2. Step 2: Convert to fraction form
    87.23/131.43 = 72.34/x
  3. Step 3: Cross multiply
    87.23x = 131.43 × 72.34
  4. Step 4: Simplify right side
    87.23x = 9,507.65
  5. Step 5: Solve for x
    x = 9,507.65/87.23
  6. Step 6: Final answer
    x = 109.00

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.