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Finding the Fourth Proportional to 79.12, 118.53 and 51.65

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Solution

The fourth proportional to 79.12, 118.53 and 51.65 is: 77.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.12 : 118.53 = 51.65 : x
  2. Step 2: Convert to fraction form
    79.12/118.53 = 51.65/x
  3. Step 3: Cross multiply
    79.12x = 118.53 × 51.65
  4. Step 4: Simplify right side
    79.12x = 6,121.48
  5. Step 5: Solve for x
    x = 6,121.48/79.12
  6. Step 6: Final answer
    x = 77.37

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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.