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Finding the Fourth Proportional to 1,369.19, 1,889.37 and 809.61

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Solution

The fourth proportional to 1,369.19, 1,889.37 and 809.61 is: 1,117.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,369.19 : 1,889.37 = 809.61 : x
  2. Step 2: Convert to fraction form
    1,369.19/1,889.37 = 809.61/x
  3. Step 3: Cross multiply
    1,369.19x = 1,889.37 × 809.61
  4. Step 4: Simplify right side
    1,369.19x = 1,529,652.85
  5. Step 5: Solve for x
    x = 1,529,652.85/1,369.19
  6. Step 6: Final answer
    x = 1,117.20

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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.