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Finding the Fourth Proportional to 79.70, 119.73 and 66.20

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Solution

The fourth proportional to 79.70, 119.73 and 66.20 is: 99.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.70 : 119.73 = 66.20 : x
  2. Step 2: Convert to fraction form
    79.70/119.73 = 66.20/x
  3. Step 3: Cross multiply
    79.70x = 119.73 × 66.20
  4. Step 4: Simplify right side
    79.70x = 7,926.13
  5. Step 5: Solve for x
    x = 7,926.13/79.70
  6. Step 6: Final answer
    x = 99.45

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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.