Home / 1,013.28-1,399.19-620.43

Finding the Fourth Proportional to 1,013.28, 1,399.19 and 620.43

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Solution

The fourth proportional to 1,013.28, 1,399.19 and 620.43 is: 856.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,013.28 : 1,399.19 = 620.43 : x
  2. Step 2: Convert to fraction form
    1,013.28/1,399.19 = 620.43/x
  3. Step 3: Cross multiply
    1,013.28x = 1,399.19 × 620.43
  4. Step 4: Simplify right side
    1,013.28x = 868,096.35
  5. Step 5: Solve for x
    x = 868,096.35/1,013.28
  6. Step 6: Final answer
    x = 856.72

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.