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Finding the Fourth Proportional to 88.79, 122.60 and 62.87

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Solution

The fourth proportional to 88.79, 122.60 and 62.87 is: 86.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.79 : 122.60 = 62.87 : x
  2. Step 2: Convert to fraction form
    88.79/122.60 = 62.87/x
  3. Step 3: Cross multiply
    88.79x = 122.60 × 62.87
  4. Step 4: Simplify right side
    88.79x = 7,707.86
  5. Step 5: Solve for x
    x = 7,707.86/88.79
  6. Step 6: Final answer
    x = 86.81

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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.