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Finding the Fourth Proportional to 1,122.12, 1,682.94 and 391.77

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Solution

The fourth proportional to 1,122.12, 1,682.94 and 391.77 is: 587.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,122.12 : 1,682.94 = 391.77 : x
  2. Step 2: Convert to fraction form
    1,122.12/1,682.94 = 391.77/x
  3. Step 3: Cross multiply
    1,122.12x = 1,682.94 × 391.77
  4. Step 4: Simplify right side
    1,122.12x = 659,325.40
  5. Step 5: Solve for x
    x = 659,325.40/1,122.12
  6. Step 6: Final answer
    x = 587.57

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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.