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Finding the Fourth Proportional to 425,895.30, 638,842.95 and 399,651.30

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Solution

The fourth proportional to 425,895.30, 638,842.95 and 399,651.30 is: 599,476.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,895.30 : 638,842.95 = 399,651.30 : x
  2. Step 2: Convert to fraction form
    425,895.30/638,842.95 = 399,651.30/x
  3. Step 3: Cross multiply
    425,895.30x = 638,842.95 × 399,651.30
  4. Step 4: Simplify right side
    425,895.30x = 255,314,415,463.34
  5. Step 5: Solve for x
    x = 255,314,415,463.34/425,895.30
  6. Step 6: Final answer
    x = 599,476.95

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Similar ratio
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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.