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Finding the Fourth Proportional to 139,788,279.20, 209,682,418.80 and 85,368,720.80

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Solution

The fourth proportional to 139,788,279.20, 209,682,418.80 and 85,368,720.80 is: 128,053,081.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,788,279.20 : 209,682,418.80 = 85,368,720.80 : x
  2. Step 2: Convert to fraction form
    139,788,279.20/209,682,418.80 = 85,368,720.80/x
  3. Step 3: Cross multiply
    139,788,279.20x = 209,682,418.80 × 85,368,720.80
  4. Step 4: Simplify right side
    139,788,279.20x = 17,900,319,867,205,872
  5. Step 5: Solve for x
    x = 17,900,319,867,205,872/139,788,279.20
  6. Step 6: Final answer
    x = 128,053,081.20

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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.