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Finding the Fourth Proportional to 287,997.80, 431,996.70 and 261,732.20

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Solution

The fourth proportional to 287,997.80, 431,996.70 and 261,732.20 is: 392,598.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,997.80 : 431,996.70 = 261,732.20 : x
  2. Step 2: Convert to fraction form
    287,997.80/431,996.70 = 261,732.20/x
  3. Step 3: Cross multiply
    287,997.80x = 431,996.70 × 261,732.20
  4. Step 4: Simplify right side
    287,997.80x = 113,067,446,683.74
  5. Step 5: Solve for x
    x = 113,067,446,683.74/287,997.80
  6. Step 6: Final answer
    x = 392,598.30

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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.