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Finding the Fourth Proportional to 87.96, 121.32 and 51.11

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Solution

The fourth proportional to 87.96, 121.32 and 51.11 is: 70.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.96 : 121.32 = 51.11 : x
  2. Step 2: Convert to fraction form
    87.96/121.32 = 51.11/x
  3. Step 3: Cross multiply
    87.96x = 121.32 × 51.11
  4. Step 4: Simplify right side
    87.96x = 6,200.51
  5. Step 5: Solve for x
    x = 6,200.51/87.96
  6. Step 6: Final answer
    x = 70.49

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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.