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Finding the Fourth Proportional to 1,079.32, 1,489.45 and 613.57

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Solution

The fourth proportional to 1,079.32, 1,489.45 and 613.57 is: 846.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,079.32 : 1,489.45 = 613.57 : x
  2. Step 2: Convert to fraction form
    1,079.32/1,489.45 = 613.57/x
  3. Step 3: Cross multiply
    1,079.32x = 1,489.45 × 613.57
  4. Step 4: Simplify right side
    1,079.32x = 913,874.39
  5. Step 5: Solve for x
    x = 913,874.39/1,079.32
  6. Step 6: Final answer
    x = 846.72

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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.