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Finding the Fourth Proportional to 1,561.10, 2,340.86 and 520.73

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Solution

The fourth proportional to 1,561.10, 2,340.86 and 520.73 is: 780.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,561.10 : 2,340.86 = 520.73 : x
  2. Step 2: Convert to fraction form
    1,561.10/2,340.86 = 520.73/x
  3. Step 3: Cross multiply
    1,561.10x = 2,340.86 × 520.73
  4. Step 4: Simplify right side
    1,561.10x = 1,218,956.03
  5. Step 5: Solve for x
    x = 1,218,956.03/1,561.10
  6. Step 6: Final answer
    x = 780.83

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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.