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Finding the Fourth Proportional to 821.52, 1,141.74 and 812.88

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Solution

The fourth proportional to 821.52, 1,141.74 and 812.88 is: 1,129.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.52 : 1,141.74 = 812.88 : x
  2. Step 2: Convert to fraction form
    821.52/1,141.74 = 812.88/x
  3. Step 3: Cross multiply
    821.52x = 1,141.74 × 812.88
  4. Step 4: Simplify right side
    821.52x = 928,097.61
  5. Step 5: Solve for x
    x = 928,097.61/821.52
  6. Step 6: Final answer
    x = 1,129.73

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.