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Finding the Fourth Proportional to 1,819.73, 2,730 and 521.21

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Solution

The fourth proportional to 1,819.73, 2,730 and 521.21 is: 781.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,819.73 : 2,730 = 521.21 : x
  2. Step 2: Convert to fraction form
    1,819.73/2,730 = 521.21/x
  3. Step 3: Cross multiply
    1,819.73x = 2,730 × 521.21
  4. Step 4: Simplify right side
    1,819.73x = 1,422,903.30
  5. Step 5: Solve for x
    x = 1,422,903.30/1,819.73
  6. Step 6: Final answer
    x = 781.93

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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.