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Finding the Fourth Proportional to 79.72, 119.08 and 66.04

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Solution

The fourth proportional to 79.72, 119.08 and 66.04 is: 98.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.72 : 119.08 = 66.04 : x
  2. Step 2: Convert to fraction form
    79.72/119.08 = 66.04/x
  3. Step 3: Cross multiply
    79.72x = 119.08 × 66.04
  4. Step 4: Simplify right side
    79.72x = 7,864.04
  5. Step 5: Solve for x
    x = 7,864.04/79.72
  6. Step 6: Final answer
    x = 98.65

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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.