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Finding the Fourth Proportional to 1,169.64, 1,613.96 and 721.74

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Solution

The fourth proportional to 1,169.64, 1,613.96 and 721.74 is: 995.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,169.64 : 1,613.96 = 721.74 : x
  2. Step 2: Convert to fraction form
    1,169.64/1,613.96 = 721.74/x
  3. Step 3: Cross multiply
    1,169.64x = 1,613.96 × 721.74
  4. Step 4: Simplify right side
    1,169.64x = 1,164,864.64
  5. Step 5: Solve for x
    x = 1,164,864.64/1,169.64
  6. Step 6: Final answer
    x = 995.92

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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.