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Finding the Fourth Proportional to 425,729.80, 637,719.90 and 215,486.20

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Solution

The fourth proportional to 425,729.80, 637,719.90 and 215,486.20 is: 322,786.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,729.80 : 637,719.90 = 215,486.20 : x
  2. Step 2: Convert to fraction form
    425,729.80/637,719.90 = 215,486.20/x
  3. Step 3: Cross multiply
    425,729.80x = 637,719.90 × 215,486.20
  4. Step 4: Simplify right side
    425,729.80x = 137,419,837,915.38
  5. Step 5: Solve for x
    x = 137,419,837,915.38/425,729.80
  6. Step 6: Final answer
    x = 322,786.51

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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.