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Finding the Fourth Proportional to 839.28, 1,256.76 and 709.68

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Solution

The fourth proportional to 839.28, 1,256.76 and 709.68 is: 1,062.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.28 : 1,256.76 = 709.68 : x
  2. Step 2: Convert to fraction form
    839.28/1,256.76 = 709.68/x
  3. Step 3: Cross multiply
    839.28x = 1,256.76 × 709.68
  4. Step 4: Simplify right side
    839.28x = 891,897.44
  5. Step 5: Solve for x
    x = 891,897.44/839.28
  6. Step 6: Final answer
    x = 1,062.69

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.