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Finding the Fourth Proportional to 821.95, 1,132.68 and 612.36

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Solution

The fourth proportional to 821.95, 1,132.68 and 612.36 is: 843.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.95 : 1,132.68 = 612.36 : x
  2. Step 2: Convert to fraction form
    821.95/1,132.68 = 612.36/x
  3. Step 3: Cross multiply
    821.95x = 1,132.68 × 612.36
  4. Step 4: Simplify right side
    821.95x = 693,610.22
  5. Step 5: Solve for x
    x = 693,610.22/821.95
  6. Step 6: Final answer
    x = 843.86

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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.