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Finding the Fourth Proportional to 139.72, 209.60 and 43.54

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Solution

The fourth proportional to 139.72, 209.60 and 43.54 is: 65.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.72 : 209.60 = 43.54 : x
  2. Step 2: Convert to fraction form
    139.72/209.60 = 43.54/x
  3. Step 3: Cross multiply
    139.72x = 209.60 × 43.54
  4. Step 4: Simplify right side
    139.72x = 9,125.98
  5. Step 5: Solve for x
    x = 9,125.98/139.72
  6. Step 6: Final answer
    x = 65.32

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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.