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Finding the Fourth Proportional to 1,392.28, 2,089.48 and 515.61

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Solution

The fourth proportional to 1,392.28, 2,089.48 and 515.61 is: 773.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,392.28 : 2,089.48 = 515.61 : x
  2. Step 2: Convert to fraction form
    1,392.28/2,089.48 = 515.61/x
  3. Step 3: Cross multiply
    1,392.28x = 2,089.48 × 515.61
  4. Step 4: Simplify right side
    1,392.28x = 1,077,356.78
  5. Step 5: Solve for x
    x = 1,077,356.78/1,392.28
  6. Step 6: Final answer
    x = 773.81

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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.