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Finding the Fourth Proportional to 99.14, 148.46 and 79.74

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Solution

The fourth proportional to 99.14, 148.46 and 79.74 is: 119.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.14 : 148.46 = 79.74 : x
  2. Step 2: Convert to fraction form
    99.14/148.46 = 79.74/x
  3. Step 3: Cross multiply
    99.14x = 148.46 × 79.74
  4. Step 4: Simplify right side
    99.14x = 11,837.80
  5. Step 5: Solve for x
    x = 11,837.80/99.14
  6. Step 6: Final answer
    x = 119.41

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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.