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Finding the Fourth Proportional to 1,079.29, 1,489.42 and 613.54

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Solution

The fourth proportional to 1,079.29, 1,489.42 and 613.54 is: 846.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,079.29 : 1,489.42 = 613.54 : x
  2. Step 2: Convert to fraction form
    1,079.29/1,489.42 = 613.54/x
  3. Step 3: Cross multiply
    1,079.29x = 1,489.42 × 613.54
  4. Step 4: Simplify right side
    1,079.29x = 913,818.75
  5. Step 5: Solve for x
    x = 913,818.75/1,079.29
  6. Step 6: Final answer
    x = 846.69

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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.