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Finding the Fourth Proportional to 425,877.96, 638,029.61 and 215,012.28

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Solution

The fourth proportional to 425,877.96, 638,029.61 and 215,012.28 is: 322,120.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,877.96 : 638,029.61 = 215,012.28 : x
  2. Step 2: Convert to fraction form
    425,877.96/638,029.61 = 215,012.28/x
  3. Step 3: Cross multiply
    425,877.96x = 638,029.61 × 215,012.28
  4. Step 4: Simplify right side
    425,877.96x = 137,184,201,153.61
  5. Step 5: Solve for x
    x = 137,184,201,153.61/425,877.96
  6. Step 6: Final answer
    x = 322,120.92

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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.