Home / 1,331.20-1,995.45-636.85

Finding the Fourth Proportional to 1,331.20, 1,995.45 and 636.85

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Solution

The fourth proportional to 1,331.20, 1,995.45 and 636.85 is: 954.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,331.20 : 1,995.45 = 636.85 : x
  2. Step 2: Convert to fraction form
    1,331.20/1,995.45 = 636.85/x
  3. Step 3: Cross multiply
    1,331.20x = 1,995.45 × 636.85
  4. Step 4: Simplify right side
    1,331.20x = 1,270,806.02
  5. Step 5: Solve for x
    x = 1,270,806.02/1,331.20
  6. Step 6: Final answer
    x = 954.63

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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.