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Finding the Fourth Proportional to 287,998.90, 431,998.35 and 267,003.70

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Solution

The fourth proportional to 287,998.90, 431,998.35 and 267,003.70 is: 400,505.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,998.90 : 431,998.35 = 267,003.70 : x
  2. Step 2: Convert to fraction form
    287,998.90/431,998.35 = 267,003.70/x
  3. Step 3: Cross multiply
    287,998.90x = 431,998.35 × 267,003.70
  4. Step 4: Simplify right side
    287,998.90x = 115,345,157,843.90
  5. Step 5: Solve for x
    x = 115,345,157,843.90/287,998.90
  6. Step 6: Final answer
    x = 400,505.55

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1.5x scale

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.