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Finding the Fourth Proportional to 1,040.97, 1,561.52 and 391.71

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Solution

The fourth proportional to 1,040.97, 1,561.52 and 391.71 is: 587.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,040.97 : 1,561.52 = 391.71 : x
  2. Step 2: Convert to fraction form
    1,040.97/1,561.52 = 391.71/x
  3. Step 3: Cross multiply
    1,040.97x = 1,561.52 × 391.71
  4. Step 4: Simplify right side
    1,040.97x = 611,661.04
  5. Step 5: Solve for x
    x = 611,661.04/1,040.97
  6. Step 6: Final answer
    x = 587.59

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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.