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Finding the Fourth Proportional to 819.22, 1,129.74 and 632.40

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Solution

The fourth proportional to 819.22, 1,129.74 and 632.40 is: 872.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    819.22 : 1,129.74 = 632.40 : x
  2. Step 2: Convert to fraction form
    819.22/1,129.74 = 632.40/x
  3. Step 3: Cross multiply
    819.22x = 1,129.74 × 632.40
  4. Step 4: Simplify right side
    819.22x = 714,447.58
  5. Step 5: Solve for x
    x = 714,447.58/819.22
  6. Step 6: Final answer
    x = 872.11

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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.