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Finding the Fourth Proportional to 92.75, 128.10 and 87.62

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Solution

The fourth proportional to 92.75, 128.10 and 87.62 is: 121.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.75 : 128.10 = 87.62 : x
  2. Step 2: Convert to fraction form
    92.75/128.10 = 87.62/x
  3. Step 3: Cross multiply
    92.75x = 128.10 × 87.62
  4. Step 4: Simplify right side
    92.75x = 11,223.48
  5. Step 5: Solve for x
    x = 11,223.48/92.75
  6. Step 6: Final answer
    x = 121.01

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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.