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Finding the Fourth Proportional to 1,040.96, 1,561.44 and 391.52

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Solution

The fourth proportional to 1,040.96, 1,561.44 and 391.52 is: 587.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,040.96 : 1,561.44 = 391.52 : x
  2. Step 2: Convert to fraction form
    1,040.96/1,561.44 = 391.52/x
  3. Step 3: Cross multiply
    1,040.96x = 1,561.44 × 391.52
  4. Step 4: Simplify right side
    1,040.96x = 611,334.99
  5. Step 5: Solve for x
    x = 611,334.99/1,040.96
  6. Step 6: Final answer
    x = 587.28

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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.