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Finding the Fourth Proportional to 993.92, 1,371.63 and 620.92

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Solution

The fourth proportional to 993.92, 1,371.63 and 620.92 is: 856.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.92 : 1,371.63 = 620.92 : x
  2. Step 2: Convert to fraction form
    993.92/1,371.63 = 620.92/x
  3. Step 3: Cross multiply
    993.92x = 1,371.63 × 620.92
  4. Step 4: Simplify right side
    993.92x = 851,668.83
  5. Step 5: Solve for x
    x = 851,668.83/993.92
  6. Step 6: Final answer
    x = 856.88

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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.