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Finding the Fourth Proportional to 92.50, 138.52 and 51.86

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Solution

The fourth proportional to 92.50, 138.52 and 51.86 is: 77.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.50 : 138.52 = 51.86 : x
  2. Step 2: Convert to fraction form
    92.50/138.52 = 51.86/x
  3. Step 3: Cross multiply
    92.50x = 138.52 × 51.86
  4. Step 4: Simplify right side
    92.50x = 7,183.65
  5. Step 5: Solve for x
    x = 7,183.65/92.50
  6. Step 6: Final answer
    x = 77.66

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.