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Finding the Fourth Proportional to 88.75, 123 and 87.40

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Solution

The fourth proportional to 88.75, 123 and 87.40 is: 121.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.75 : 123 = 87.40 : x
  2. Step 2: Convert to fraction form
    88.75/123 = 87.40/x
  3. Step 3: Cross multiply
    88.75x = 123 × 87.40
  4. Step 4: Simplify right side
    88.75x = 10,750.20
  5. Step 5: Solve for x
    x = 10,750.20/88.75
  6. Step 6: Final answer
    x = 121.13

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.