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Finding the Fourth Proportional to 87.65, 121.01 and 50.81

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Solution

The fourth proportional to 87.65, 121.01 and 50.81 is: 70.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.65 : 121.01 = 50.81 : x
  2. Step 2: Convert to fraction form
    87.65/121.01 = 50.81/x
  3. Step 3: Cross multiply
    87.65x = 121.01 × 50.81
  4. Step 4: Simplify right side
    87.65x = 6,147.66
  5. Step 5: Solve for x
    x = 6,147.66/87.65
  6. Step 6: Final answer
    x = 70.14

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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.