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Finding the Fourth Proportional to 1,040.94, 1,562.04 and 391.68

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Solution

The fourth proportional to 1,040.94, 1,562.04 and 391.68 is: 587.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,040.94 : 1,562.04 = 391.68 : x
  2. Step 2: Convert to fraction form
    1,040.94/1,562.04 = 391.68/x
  3. Step 3: Cross multiply
    1,040.94x = 1,562.04 × 391.68
  4. Step 4: Simplify right side
    1,040.94x = 611,819.83
  5. Step 5: Solve for x
    x = 611,819.83/1,040.94
  6. Step 6: Final answer
    x = 587.76

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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.