Home / 1,331.28-1,995.09-680.66

Finding the Fourth Proportional to 1,331.28, 1,995.09 and 680.66

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Solution

The fourth proportional to 1,331.28, 1,995.09 and 680.66 is: 1,020.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,331.28 : 1,995.09 = 680.66 : x
  2. Step 2: Convert to fraction form
    1,331.28/1,995.09 = 680.66/x
  3. Step 3: Cross multiply
    1,331.28x = 1,995.09 × 680.66
  4. Step 4: Simplify right side
    1,331.28x = 1,357,967.98
  5. Step 5: Solve for x
    x = 1,357,967.98/1,331.28
  6. Step 6: Final answer
    x = 1,020.05

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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.