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Finding the Fourth Proportional to 425,404.80, 638,107.20 and 172,806.30

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Solution

The fourth proportional to 425,404.80, 638,107.20 and 172,806.30 is: 259,209.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,404.80 : 638,107.20 = 172,806.30 : x
  2. Step 2: Convert to fraction form
    425,404.80/638,107.20 = 172,806.30/x
  3. Step 3: Cross multiply
    425,404.80x = 638,107.20 × 172,806.30
  4. Step 4: Simplify right side
    425,404.80x = 110,268,944,235.36
  5. Step 5: Solve for x
    x = 110,268,944,235.36/425,404.80
  6. Step 6: Final answer
    x = 259,209.45

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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.