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Finding the Fourth Proportional to 92.79, 138.59 and 77.58

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Solution

The fourth proportional to 92.79, 138.59 and 77.58 is: 115.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.79 : 138.59 = 77.58 : x
  2. Step 2: Convert to fraction form
    92.79/138.59 = 77.58/x
  3. Step 3: Cross multiply
    92.79x = 138.59 × 77.58
  4. Step 4: Simplify right side
    92.79x = 10,751.42
  5. Step 5: Solve for x
    x = 10,751.42/92.79
  6. Step 6: Final answer
    x = 115.87

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.