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Finding the Fourth Proportional to 2,218.60, 3,328.28 and 920.96

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Solution

The fourth proportional to 2,218.60, 3,328.28 and 920.96 is: 1,381.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,218.60 : 3,328.28 = 920.96 : x
  2. Step 2: Convert to fraction form
    2,218.60/3,328.28 = 920.96/x
  3. Step 3: Cross multiply
    2,218.60x = 3,328.28 × 920.96
  4. Step 4: Simplify right side
    2,218.60x = 3,065,212.75
  5. Step 5: Solve for x
    x = 3,065,212.75/2,218.60
  6. Step 6: Final answer
    x = 1,381.60

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1.5x scale

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.