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Finding the Fourth Proportional to 92.87, 128.25 and 87.77

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Solution

The fourth proportional to 92.87, 128.25 and 87.77 is: 121.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.87 : 128.25 = 87.77 : x
  2. Step 2: Convert to fraction form
    92.87/128.25 = 87.77/x
  3. Step 3: Cross multiply
    92.87x = 128.25 × 87.77
  4. Step 4: Simplify right side
    92.87x = 11,256.50
  5. Step 5: Solve for x
    x = 11,256.50/92.87
  6. Step 6: Final answer
    x = 121.21

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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.