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Finding the Fourth Proportional to 1,041.28, 1,561.11 and 521.03

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Solution

The fourth proportional to 1,041.28, 1,561.11 and 521.03 is: 781.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,041.28 : 1,561.11 = 521.03 : x
  2. Step 2: Convert to fraction form
    1,041.28/1,561.11 = 521.03/x
  3. Step 3: Cross multiply
    1,041.28x = 1,561.11 × 521.03
  4. Step 4: Simplify right side
    1,041.28x = 813,374.73
  5. Step 5: Solve for x
    x = 813,374.73/1,041.28
  6. Step 6: Final answer
    x = 781.13

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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.