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Finding the Fourth Proportional to 819.38, 1,128.16 and 723.46

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Solution

The fourth proportional to 819.38, 1,128.16 and 723.46 is: 996.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    819.38 : 1,128.16 = 723.46 : x
  2. Step 2: Convert to fraction form
    819.38/1,128.16 = 723.46/x
  3. Step 3: Cross multiply
    819.38x = 1,128.16 × 723.46
  4. Step 4: Simplify right side
    819.38x = 816,178.63
  5. Step 5: Solve for x
    x = 816,178.63/819.38
  6. Step 6: Final answer
    x = 996.09

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1.5x scale

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.