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Finding the Fourth Proportional to 425,687.78, 638,947.20 and 351,563.06

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Solution

The fourth proportional to 425,687.78, 638,947.20 and 351,563.06 is: 527,687.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,687.78 : 638,947.20 = 351,563.06 : x
  2. Step 2: Convert to fraction form
    425,687.78/638,947.20 = 351,563.06/x
  3. Step 3: Cross multiply
    425,687.78x = 638,947.20 × 351,563.06
  4. Step 4: Simplify right side
    425,687.78x = 224,630,232,810.43
  5. Step 5: Solve for x
    x = 224,630,232,810.43/425,687.78
  6. Step 6: Final answer
    x = 527,687.76

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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.