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Finding the Fourth Proportional to 139.95, 209.89 and 71.41

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Solution

The fourth proportional to 139.95, 209.89 and 71.41 is: 107.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.95 : 209.89 = 71.41 : x
  2. Step 2: Convert to fraction form
    139.95/209.89 = 71.41/x
  3. Step 3: Cross multiply
    139.95x = 209.89 × 71.41
  4. Step 4: Simplify right side
    139.95x = 14,988.24
  5. Step 5: Solve for x
    x = 14,988.24/139.95
  6. Step 6: Final answer
    x = 107.10

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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.