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Finding the Fourth Proportional to 819.66, 1,230.22 and 435.18

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Solution

The fourth proportional to 819.66, 1,230.22 and 435.18 is: 653.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    819.66 : 1,230.22 = 435.18 : x
  2. Step 2: Convert to fraction form
    819.66/1,230.22 = 435.18/x
  3. Step 3: Cross multiply
    819.66x = 1,230.22 × 435.18
  4. Step 4: Simplify right side
    819.66x = 535,367.14
  5. Step 5: Solve for x
    x = 535,367.14/819.66
  6. Step 6: Final answer
    x = 653.16

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.