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Finding the Fourth Proportional to 639,712.80, 958,694.40 and 425,872.80

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Solution

The fourth proportional to 639,712.80, 958,694.40 and 425,872.80 is: 638,226.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,712.80 : 958,694.40 = 425,872.80 : x
  2. Step 2: Convert to fraction form
    639,712.80/958,694.40 = 425,872.80/x
  3. Step 3: Cross multiply
    639,712.80x = 958,694.40 × 425,872.80
  4. Step 4: Simplify right side
    639,712.80x = 408,281,868,472.32
  5. Step 5: Solve for x
    x = 408,281,868,472.32/639,712.80
  6. Step 6: Final answer
    x = 638,226.82

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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.