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Finding the Fourth Proportional to 425,896.61, 639,238.57 and 215,682.17

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Solution

The fourth proportional to 425,896.61, 639,238.57 and 215,682.17 is: 323,722.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,896.61 : 639,238.57 = 215,682.17 : x
  2. Step 2: Convert to fraction form
    425,896.61/639,238.57 = 215,682.17/x
  3. Step 3: Cross multiply
    425,896.61x = 639,238.57 × 215,682.17
  4. Step 4: Simplify right side
    425,896.61x = 137,872,358,189.90
  5. Step 5: Solve for x
    x = 137,872,358,189.90/425,896.61
  6. Step 6: Final answer
    x = 323,722.60

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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.