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Finding the Fourth Proportional to 1,013.91, 1,399.11 and 620.93

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Solution

The fourth proportional to 1,013.91, 1,399.11 and 620.93 is: 856.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,013.91 : 1,399.11 = 620.93 : x
  2. Step 2: Convert to fraction form
    1,013.91/1,399.11 = 620.93/x
  3. Step 3: Cross multiply
    1,013.91x = 1,399.11 × 620.93
  4. Step 4: Simplify right side
    1,013.91x = 868,742.38
  5. Step 5: Solve for x
    x = 868,742.38/1,013.91
  6. Step 6: Final answer
    x = 856.82

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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.