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Finding the Fourth Proportional to 1,040.92, 1,561.32 and 391.60

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Solution

The fourth proportional to 1,040.92, 1,561.32 and 391.60 is: 587.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,040.92 : 1,561.32 = 391.60 : x
  2. Step 2: Convert to fraction form
    1,040.92/1,561.32 = 391.60/x
  3. Step 3: Cross multiply
    1,040.92x = 1,561.32 × 391.60
  4. Step 4: Simplify right side
    1,040.92x = 611,412.91
  5. Step 5: Solve for x
    x = 611,412.91/1,040.92
  6. Step 6: Final answer
    x = 587.38

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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.