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Finding the Fourth Proportional to 88.70, 122.52 and 77.76

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Solution

The fourth proportional to 88.70, 122.52 and 77.76 is: 107.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.70 : 122.52 = 77.76 : x
  2. Step 2: Convert to fraction form
    88.70/122.52 = 77.76/x
  3. Step 3: Cross multiply
    88.70x = 122.52 × 77.76
  4. Step 4: Simplify right side
    88.70x = 9,527.16
  5. Step 5: Solve for x
    x = 9,527.16/88.70
  6. Step 6: Final answer
    x = 107.41

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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.