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Finding the Fourth Proportional to 1,079.25, 1,489.64 and 613.77

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Solution

The fourth proportional to 1,079.25, 1,489.64 and 613.77 is: 847.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,079.25 : 1,489.64 = 613.77 : x
  2. Step 2: Convert to fraction form
    1,079.25/1,489.64 = 613.77/x
  3. Step 3: Cross multiply
    1,079.25x = 1,489.64 × 613.77
  4. Step 4: Simplify right side
    1,079.25x = 914,293.27
  5. Step 5: Solve for x
    x = 914,293.27/1,079.25
  6. Step 6: Final answer
    x = 847.16

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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.