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Finding the Fourth Proportional to 72.65, 108.93 and 49.79

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Solution

The fourth proportional to 72.65, 108.93 and 49.79 is: 74.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.65 : 108.93 = 49.79 : x
  2. Step 2: Convert to fraction form
    72.65/108.93 = 49.79/x
  3. Step 3: Cross multiply
    72.65x = 108.93 × 49.79
  4. Step 4: Simplify right side
    72.65x = 5,423.62
  5. Step 5: Solve for x
    x = 5,423.62/72.65
  6. Step 6: Final answer
    x = 74.65

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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.