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Finding the Fourth Proportional to 1,040.75, 1,561.40 and 520.11

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Solution

The fourth proportional to 1,040.75, 1,561.40 and 520.11 is: 780.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,040.75 : 1,561.40 = 520.11 : x
  2. Step 2: Convert to fraction form
    1,040.75/1,561.40 = 520.11/x
  3. Step 3: Cross multiply
    1,040.75x = 1,561.40 × 520.11
  4. Step 4: Simplify right side
    1,040.75x = 812,097.15
  5. Step 5: Solve for x
    x = 812,097.15/1,040.75
  6. Step 6: Final answer
    x = 780.30

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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.