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Finding the Fourth Proportional to 1,121.79, 1,683.22 and 505.69

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Solution

The fourth proportional to 1,121.79, 1,683.22 and 505.69 is: 758.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.79 : 1,683.22 = 505.69 : x
  2. Step 2: Convert to fraction form
    1,121.79/1,683.22 = 505.69/x
  3. Step 3: Cross multiply
    1,121.79x = 1,683.22 × 505.69
  4. Step 4: Simplify right side
    1,121.79x = 851,182.05
  5. Step 5: Solve for x
    x = 851,182.05/1,121.79
  6. Step 6: Final answer
    x = 758.77

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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.