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Finding the Fourth Proportional to 819.30, 1,130.65 and 446.28

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Solution

The fourth proportional to 819.30, 1,130.65 and 446.28 is: 615.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    819.30 : 1,130.65 = 446.28 : x
  2. Step 2: Convert to fraction form
    819.30/1,130.65 = 446.28/x
  3. Step 3: Cross multiply
    819.30x = 1,130.65 × 446.28
  4. Step 4: Simplify right side
    819.30x = 504,586.48
  5. Step 5: Solve for x
    x = 504,586.48/819.30
  6. Step 6: Final answer
    x = 615.88

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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.