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Finding the Fourth Proportional to 88.50, 122.22 and 87.90

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Solution

The fourth proportional to 88.50, 122.22 and 87.90 is: 121.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.50 : 122.22 = 87.90 : x
  2. Step 2: Convert to fraction form
    88.50/122.22 = 87.90/x
  3. Step 3: Cross multiply
    88.50x = 122.22 × 87.90
  4. Step 4: Simplify right side
    88.50x = 10,743.14
  5. Step 5: Solve for x
    x = 10,743.14/88.50
  6. Step 6: Final answer
    x = 121.39

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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.