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Finding the Fourth Proportional to 1,031.76, 1,423.25 and 611.71

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Solution

The fourth proportional to 1,031.76, 1,423.25 and 611.71 is: 843.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,031.76 : 1,423.25 = 611.71 : x
  2. Step 2: Convert to fraction form
    1,031.76/1,423.25 = 611.71/x
  3. Step 3: Cross multiply
    1,031.76x = 1,423.25 × 611.71
  4. Step 4: Simplify right side
    1,031.76x = 870,614.23
  5. Step 5: Solve for x
    x = 870,614.23/1,031.76
  6. Step 6: Final answer
    x = 843.81

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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.