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Finding the Fourth Proportional to 819.80, 1,228.44 and 613.40

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Solution

The fourth proportional to 819.80, 1,228.44 and 613.40 is: 919.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    819.80 : 1,228.44 = 613.40 : x
  2. Step 2: Convert to fraction form
    819.80/1,228.44 = 613.40/x
  3. Step 3: Cross multiply
    819.80x = 1,228.44 × 613.40
  4. Step 4: Simplify right side
    819.80x = 753,525.10
  5. Step 5: Solve for x
    x = 753,525.10/819.80
  6. Step 6: Final answer
    x = 919.16

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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.