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Finding the Fourth Proportional to 139.51, 209.14 and 75.43

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Solution

The fourth proportional to 139.51, 209.14 and 75.43 is: 113.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.51 : 209.14 = 75.43 : x
  2. Step 2: Convert to fraction form
    139.51/209.14 = 75.43/x
  3. Step 3: Cross multiply
    139.51x = 209.14 × 75.43
  4. Step 4: Simplify right side
    139.51x = 15,775.43
  5. Step 5: Solve for x
    x = 15,775.43/139.51
  6. Step 6: Final answer
    x = 113.08

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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.