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Finding the Fourth Proportional to 425,427.60, 638,141.40 and 215,475.60

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Solution

The fourth proportional to 425,427.60, 638,141.40 and 215,475.60 is: 323,213.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,427.60 : 638,141.40 = 215,475.60 : x
  2. Step 2: Convert to fraction form
    425,427.60/638,141.40 = 215,475.60/x
  3. Step 3: Cross multiply
    425,427.60x = 638,141.40 × 215,475.60
  4. Step 4: Simplify right side
    425,427.60x = 137,503,901,049.84
  5. Step 5: Solve for x
    x = 137,503,901,049.84/425,427.60
  6. Step 6: Final answer
    x = 323,213.40

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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.