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Finding the Fourth Proportional to 88.30, 122.78 and 87.76

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Solution

The fourth proportional to 88.30, 122.78 and 87.76 is: 122.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.30 : 122.78 = 87.76 : x
  2. Step 2: Convert to fraction form
    88.30/122.78 = 87.76/x
  3. Step 3: Cross multiply
    88.30x = 122.78 × 87.76
  4. Step 4: Simplify right side
    88.30x = 10,775.17
  5. Step 5: Solve for x
    x = 10,775.17/88.30
  6. Step 6: Final answer
    x = 122.03

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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.