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Finding the Fourth Proportional to 139.93, 209.90 and 79.02

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Solution

The fourth proportional to 139.93, 209.90 and 79.02 is: 118.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.93 : 209.90 = 79.02 : x
  2. Step 2: Convert to fraction form
    139.93/209.90 = 79.02/x
  3. Step 3: Cross multiply
    139.93x = 209.90 × 79.02
  4. Step 4: Simplify right side
    139.93x = 16,586.87
  5. Step 5: Solve for x
    x = 16,586.87/139.93
  6. Step 6: Final answer
    x = 118.53

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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.