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Finding the Fourth Proportional to 267,939.40, 401,217.90 and 212,643.40

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Solution

The fourth proportional to 267,939.40, 401,217.90 and 212,643.40 is: 318,416.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    267,939.40 : 401,217.90 = 212,643.40 : x
  2. Step 2: Convert to fraction form
    267,939.40/401,217.90 = 212,643.40/x
  3. Step 3: Cross multiply
    267,939.40x = 401,217.90 × 212,643.40
  4. Step 4: Simplify right side
    267,939.40x = 85,316,338,396.86
  5. Step 5: Solve for x
    x = 85,316,338,396.86/267,939.40
  6. Step 6: Final answer
    x = 318,416.55

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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.