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Finding the Fourth Proportional to 1,178.81, 1,766.19 and 812.29

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Solution

The fourth proportional to 1,178.81, 1,766.19 and 812.29 is: 1,217.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,178.81 : 1,766.19 = 812.29 : x
  2. Step 2: Convert to fraction form
    1,178.81/1,766.19 = 812.29/x
  3. Step 3: Cross multiply
    1,178.81x = 1,766.19 × 812.29
  4. Step 4: Simplify right side
    1,178.81x = 1,434,658.48
  5. Step 5: Solve for x
    x = 1,434,658.48/1,178.81
  6. Step 6: Final answer
    x = 1,217.04

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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.