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Finding the Fourth Proportional to 1,818.60, 2,727.78 and 520.20

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Solution

The fourth proportional to 1,818.60, 2,727.78 and 520.20 is: 780.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,818.60 : 2,727.78 = 520.20 : x
  2. Step 2: Convert to fraction form
    1,818.60/2,727.78 = 520.20/x
  3. Step 3: Cross multiply
    1,818.60x = 2,727.78 × 520.20
  4. Step 4: Simplify right side
    1,818.60x = 1,418,991.16
  5. Step 5: Solve for x
    x = 1,418,991.16/1,818.60
  6. Step 6: Final answer
    x = 780.27

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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.