Home / 687,787.20-1,031,680.80-641,131.20

Finding the Fourth Proportional to 687,787.20, 1,031,680.80 and 641,131.20

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Solution

The fourth proportional to 687,787.20, 1,031,680.80 and 641,131.20 is: 961,696.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    687,787.20 : 1,031,680.80 = 641,131.20 : x
  2. Step 2: Convert to fraction form
    687,787.20/1,031,680.80 = 641,131.20/x
  3. Step 3: Cross multiply
    687,787.20x = 1,031,680.80 × 641,131.20
  4. Step 4: Simplify right side
    687,787.20x = 661,442,749,320.96
  5. Step 5: Solve for x
    x = 661,442,749,320.96/687,787.20
  6. Step 6: Final answer
    x = 961,696.80

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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.