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Finding the Fourth Proportional to 72.42, 108.46 and 51.79

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Solution

The fourth proportional to 72.42, 108.46 and 51.79 is: 77.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.42 : 108.46 = 51.79 : x
  2. Step 2: Convert to fraction form
    72.42/108.46 = 51.79/x
  3. Step 3: Cross multiply
    72.42x = 108.46 × 51.79
  4. Step 4: Simplify right side
    72.42x = 5,617.14
  5. Step 5: Solve for x
    x = 5,617.14/72.42
  6. Step 6: Final answer
    x = 77.56

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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.