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Finding the Fourth Proportional to 287,600.80, 431,401.20 and 267,917.80

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Solution

The fourth proportional to 287,600.80, 431,401.20 and 267,917.80 is: 401,876.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,600.80 : 431,401.20 = 267,917.80 : x
  2. Step 2: Convert to fraction form
    287,600.80/431,401.20 = 267,917.80/x
  3. Step 3: Cross multiply
    287,600.80x = 431,401.20 × 267,917.80
  4. Step 4: Simplify right side
    287,600.80x = 115,580,060,421.36
  5. Step 5: Solve for x
    x = 115,580,060,421.36/287,600.80
  6. Step 6: Final answer
    x = 401,876.70

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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.