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Finding the Fourth Proportional to 425,872.08, 638,020.80 and 215,006.40

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Solution

The fourth proportional to 425,872.08, 638,020.80 and 215,006.40 is: 322,112.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,872.08 : 638,020.80 = 215,006.40 : x
  2. Step 2: Convert to fraction form
    425,872.08/638,020.80 = 215,006.40/x
  3. Step 3: Cross multiply
    425,872.08x = 638,020.80 × 215,006.40
  4. Step 4: Simplify right side
    425,872.08x = 137,178,555,333.12
  5. Step 5: Solve for x
    x = 137,178,555,333.12/425,872.08
  6. Step 6: Final answer
    x = 322,112.11

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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.