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Finding the Fourth Proportional to 1,040.80, 1,560.03 and 520.15

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Solution

The fourth proportional to 1,040.80, 1,560.03 and 520.15 is: 779.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,040.80 : 1,560.03 = 520.15 : x
  2. Step 2: Convert to fraction form
    1,040.80/1,560.03 = 520.15/x
  3. Step 3: Cross multiply
    1,040.80x = 1,560.03 × 520.15
  4. Step 4: Simplify right side
    1,040.80x = 811,449.60
  5. Step 5: Solve for x
    x = 811,449.60/1,040.80
  6. Step 6: Final answer
    x = 779.64

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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.