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Finding the Fourth Proportional to 2,868.20, 4,302.78 and 920.20

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Solution

The fourth proportional to 2,868.20, 4,302.78 and 920.20 is: 1,380.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,868.20 : 4,302.78 = 920.20 : x
  2. Step 2: Convert to fraction form
    2,868.20/4,302.78 = 920.20/x
  3. Step 3: Cross multiply
    2,868.20x = 4,302.78 × 920.20
  4. Step 4: Simplify right side
    2,868.20x = 3,959,418.16
  5. Step 5: Solve for x
    x = 3,959,418.16/2,868.20
  6. Step 6: Final answer
    x = 1,380.45

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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.