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Finding the Fourth Proportional to 425,612,063.80, 638,418,095.70 and 280,209,806.20

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Solution

The fourth proportional to 425,612,063.80, 638,418,095.70 and 280,209,806.20 is: 420,314,709.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,612,063.80 : 638,418,095.70 = 280,209,806.20 : x
  2. Step 2: Convert to fraction form
    425,612,063.80/638,418,095.70 = 280,209,806.20/x
  3. Step 3: Cross multiply
    425,612,063.80x = 638,418,095.70 × 280,209,806.20
  4. Step 4: Simplify right side
    425,612,063.80x = 178,891,010,870,670,048
  5. Step 5: Solve for x
    x = 178,891,010,870,670,048/425,612,063.80
  6. Step 6: Final answer
    x = 420,314,709.30

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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.