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Finding the Fourth Proportional to 1,040.12, 1,436 and 725.92

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Solution

The fourth proportional to 1,040.12, 1,436 and 725.92 is: 1,002.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,040.12 : 1,436 = 725.92 : x
  2. Step 2: Convert to fraction form
    1,040.12/1,436 = 725.92/x
  3. Step 3: Cross multiply
    1,040.12x = 1,436 × 725.92
  4. Step 4: Simplify right side
    1,040.12x = 1,042,421.12
  5. Step 5: Solve for x
    x = 1,042,421.12/1,040.12
  6. Step 6: Final answer
    x = 1,002.21

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.