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Finding the Fourth Proportional to 139,357.38, 209,965.79 and 126,045.74

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Solution

The fourth proportional to 139,357.38, 209,965.79 and 126,045.74 is: 189,909.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,357.38 : 209,965.79 = 126,045.74 : x
  2. Step 2: Convert to fraction form
    139,357.38/209,965.79 = 126,045.74/x
  3. Step 3: Cross multiply
    139,357.38x = 209,965.79 × 126,045.74
  4. Step 4: Simplify right side
    139,357.38x = 26,465,293,375.23
  5. Step 5: Solve for x
    x = 26,465,293,375.23/139,357.38
  6. Step 6: Final answer
    x = 189,909.52

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.