Home / 1,108.92-1,520.39-1,089.17

Finding the Fourth Proportional to 1,108.92, 1,520.39 and 1,089.17

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Solution

The fourth proportional to 1,108.92, 1,520.39 and 1,089.17 is: 1,493.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,108.92 : 1,520.39 = 1,089.17 : x
  2. Step 2: Convert to fraction form
    1,108.92/1,520.39 = 1,089.17/x
  3. Step 3: Cross multiply
    1,108.92x = 1,520.39 × 1,089.17
  4. Step 4: Simplify right side
    1,108.92x = 1,655,963.18
  5. Step 5: Solve for x
    x = 1,655,963.18/1,108.92
  6. Step 6: Final answer
    x = 1,493.31

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.