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Finding the Fourth Proportional to 139,920.30, 209,818.53 and 40,057.74

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Solution

The fourth proportional to 139,920.30, 209,818.53 and 40,057.74 is: 60,068.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,920.30 : 209,818.53 = 40,057.74 : x
  2. Step 2: Convert to fraction form
    139,920.30/209,818.53 = 40,057.74/x
  3. Step 3: Cross multiply
    139,920.30x = 209,818.53 × 40,057.74
  4. Step 4: Simplify right side
    139,920.30x = 8,404,856,121.92
  5. Step 5: Solve for x
    x = 8,404,856,121.92/139,920.30
  6. Step 6: Final answer
    x = 60,068.88

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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.