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Finding the Fourth Proportional to 1,121.63, 1,682.42 and 391.19

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Solution

The fourth proportional to 1,121.63, 1,682.42 and 391.19 is: 586.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.63 : 1,682.42 = 391.19 : x
  2. Step 2: Convert to fraction form
    1,121.63/1,682.42 = 391.19/x
  3. Step 3: Cross multiply
    1,121.63x = 1,682.42 × 391.19
  4. Step 4: Simplify right side
    1,121.63x = 658,135.51
  5. Step 5: Solve for x
    x = 658,135.51/1,121.63
  6. Step 6: Final answer
    x = 586.77

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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.