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Finding the Fourth Proportional to 1,040.96, 1,561.62 and 520.98

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Solution

The fourth proportional to 1,040.96, 1,561.62 and 520.98 is: 781.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,040.96 : 1,561.62 = 520.98 : x
  2. Step 2: Convert to fraction form
    1,040.96/1,561.62 = 520.98/x
  3. Step 3: Cross multiply
    1,040.96x = 1,561.62 × 520.98
  4. Step 4: Simplify right side
    1,040.96x = 813,572.79
  5. Step 5: Solve for x
    x = 813,572.79/1,040.96
  6. Step 6: Final answer
    x = 781.56

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Double scale
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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.