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Finding the Fourth Proportional to 821.78, 1,134.30 and 559.94

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Solution

The fourth proportional to 821.78, 1,134.30 and 559.94 is: 772.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.78 : 1,134.30 = 559.94 : x
  2. Step 2: Convert to fraction form
    821.78/1,134.30 = 559.94/x
  3. Step 3: Cross multiply
    821.78x = 1,134.30 × 559.94
  4. Step 4: Simplify right side
    821.78x = 635,139.94
  5. Step 5: Solve for x
    x = 635,139.94/821.78
  6. Step 6: Final answer
    x = 772.89

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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.