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Finding the Fourth Proportional to 1,281.29, 1,767.98 and 721.73

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Solution

The fourth proportional to 1,281.29, 1,767.98 and 721.73 is: 995.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,281.29 : 1,767.98 = 721.73 : x
  2. Step 2: Convert to fraction form
    1,281.29/1,767.98 = 721.73/x
  3. Step 3: Cross multiply
    1,281.29x = 1,767.98 × 721.73
  4. Step 4: Simplify right side
    1,281.29x = 1,276,004.21
  5. Step 5: Solve for x
    x = 1,276,004.21/1,281.29
  6. Step 6: Final answer
    x = 995.87

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1.5x scale

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.