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Finding the Fourth Proportional to 819.22, 1,129.62 and 609.79

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Solution

The fourth proportional to 819.22, 1,129.62 and 609.79 is: 840.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    819.22 : 1,129.62 = 609.79 : x
  2. Step 2: Convert to fraction form
    819.22/1,129.62 = 609.79/x
  3. Step 3: Cross multiply
    819.22x = 1,129.62 × 609.79
  4. Step 4: Simplify right side
    819.22x = 688,830.98
  5. Step 5: Solve for x
    x = 688,830.98/819.22
  6. Step 6: Final answer
    x = 840.84

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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.