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Finding the Fourth Proportional to 425,418.30, 638,127.45 and 172,819.80

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Solution

The fourth proportional to 425,418.30, 638,127.45 and 172,819.80 is: 259,229.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,418.30 : 638,127.45 = 172,819.80 : x
  2. Step 2: Convert to fraction form
    425,418.30/638,127.45 = 172,819.80/x
  3. Step 3: Cross multiply
    425,418.30x = 638,127.45 × 172,819.80
  4. Step 4: Simplify right side
    425,418.30x = 110,281,058,283.51
  5. Step 5: Solve for x
    x = 110,281,058,283.51/425,418.30
  6. Step 6: Final answer
    x = 259,229.70

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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.