Home / 693,992.80-1,040,989.20-428,272.30

Finding the Fourth Proportional to 693,992.80, 1,040,989.20 and 428,272.30

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Solution

The fourth proportional to 693,992.80, 1,040,989.20 and 428,272.30 is: 642,408.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    693,992.80 : 1,040,989.20 = 428,272.30 : x
  2. Step 2: Convert to fraction form
    693,992.80/1,040,989.20 = 428,272.30/x
  3. Step 3: Cross multiply
    693,992.80x = 1,040,989.20 × 428,272.30
  4. Step 4: Simplify right side
    693,992.80x = 445,826,838,959.16
  5. Step 5: Solve for x
    x = 445,826,838,959.16/693,992.80
  6. Step 6: Final answer
    x = 642,408.45

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Double scale
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Similar ratio
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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.