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Finding the Fourth Proportional to 826.28, 1,140.20 and 494.58

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Solution

The fourth proportional to 826.28, 1,140.20 and 494.58 is: 682.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    826.28 : 1,140.20 = 494.58 : x
  2. Step 2: Convert to fraction form
    826.28/1,140.20 = 494.58/x
  3. Step 3: Cross multiply
    826.28x = 1,140.20 × 494.58
  4. Step 4: Simplify right side
    826.28x = 563,921.96
  5. Step 5: Solve for x
    x = 563,921.96/826.28
  6. Step 6: Final answer
    x = 682.49

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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.