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Finding the Fourth Proportional to 823.60, 1,139.56 and 718.92

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Solution

The fourth proportional to 823.60, 1,139.56 and 718.92 is: 994.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    823.60 : 1,139.56 = 718.92 : x
  2. Step 2: Convert to fraction form
    823.60/1,139.56 = 718.92/x
  3. Step 3: Cross multiply
    823.60x = 1,139.56 × 718.92
  4. Step 4: Simplify right side
    823.60x = 819,252.48
  5. Step 5: Solve for x
    x = 819,252.48/823.60
  6. Step 6: Final answer
    x = 994.72

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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.