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Finding the Fourth Proportional to 1,108.43, 1,529.65 and 611.09

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Solution

The fourth proportional to 1,108.43, 1,529.65 and 611.09 is: 843.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,108.43 : 1,529.65 = 611.09 : x
  2. Step 2: Convert to fraction form
    1,108.43/1,529.65 = 611.09/x
  3. Step 3: Cross multiply
    1,108.43x = 1,529.65 × 611.09
  4. Step 4: Simplify right side
    1,108.43x = 934,754.20
  5. Step 5: Solve for x
    x = 934,754.20/1,108.43
  6. Step 6: Final answer
    x = 843.31

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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.