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Finding the Fourth Proportional to 1,039.91, 1,560.11 and 520.13

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Solution

The fourth proportional to 1,039.91, 1,560.11 and 520.13 is: 780.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,039.91 : 1,560.11 = 520.13 : x
  2. Step 2: Convert to fraction form
    1,039.91/1,560.11 = 520.13/x
  3. Step 3: Cross multiply
    1,039.91x = 1,560.11 × 520.13
  4. Step 4: Simplify right side
    1,039.91x = 811,449.61
  5. Step 5: Solve for x
    x = 811,449.61/1,039.91
  6. Step 6: Final answer
    x = 780.31

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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.