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Finding the Fourth Proportional to 1,116.78, 1,674.80 and 809.34

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Solution

The fourth proportional to 1,116.78, 1,674.80 and 809.34 is: 1,213.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,116.78 : 1,674.80 = 809.34 : x
  2. Step 2: Convert to fraction form
    1,116.78/1,674.80 = 809.34/x
  3. Step 3: Cross multiply
    1,116.78x = 1,674.80 × 809.34
  4. Step 4: Simplify right side
    1,116.78x = 1,355,474.26
  5. Step 5: Solve for x
    x = 1,355,474.26/1,116.78
  6. Step 6: Final answer
    x = 1,213.74

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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.