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Finding the Fourth Proportional to 1,108.89, 1,529.61 and 809.75

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Solution

The fourth proportional to 1,108.89, 1,529.61 and 809.75 is: 1,116.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,108.89 : 1,529.61 = 809.75 : x
  2. Step 2: Convert to fraction form
    1,108.89/1,529.61 = 809.75/x
  3. Step 3: Cross multiply
    1,108.89x = 1,529.61 × 809.75
  4. Step 4: Simplify right side
    1,108.89x = 1,238,594.05
  5. Step 5: Solve for x
    x = 1,238,594.05/1,108.89
  6. Step 6: Final answer
    x = 1,116.97

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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.