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Finding the Fourth Proportional to 2,218.86, 3,328.74 and 920.52

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Solution

The fourth proportional to 2,218.86, 3,328.74 and 920.52 is: 1,380.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,218.86 : 3,328.74 = 920.52 : x
  2. Step 2: Convert to fraction form
    2,218.86/3,328.74 = 920.52/x
  3. Step 3: Cross multiply
    2,218.86x = 3,328.74 × 920.52
  4. Step 4: Simplify right side
    2,218.86x = 3,064,171.74
  5. Step 5: Solve for x
    x = 3,064,171.74/2,218.86
  6. Step 6: Final answer
    x = 1,380.97

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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.