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Finding the Fourth Proportional to 425,896.60, 638,844.90 and 391,490.20

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Solution

The fourth proportional to 425,896.60, 638,844.90 and 391,490.20 is: 587,235.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,896.60 : 638,844.90 = 391,490.20 : x
  2. Step 2: Convert to fraction form
    425,896.60/638,844.90 = 391,490.20/x
  3. Step 3: Cross multiply
    425,896.60x = 638,844.90 × 391,490.20
  4. Step 4: Simplify right side
    425,896.60x = 250,101,517,669.98
  5. Step 5: Solve for x
    x = 250,101,517,669.98/425,896.60
  6. Step 6: Final answer
    x = 587,235.30

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1.5x scale

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.