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Finding the Fourth Proportional to 5,721.20, 8,568.20 and 2,790.08

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Solution

The fourth proportional to 5,721.20, 8,568.20 and 2,790.08 is: 4,178.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,721.20 : 8,568.20 = 2,790.08 : x
  2. Step 2: Convert to fraction form
    5,721.20/8,568.20 = 2,790.08/x
  3. Step 3: Cross multiply
    5,721.20x = 8,568.20 × 2,790.08
  4. Step 4: Simplify right side
    5,721.20x = 23,905,963.46
  5. Step 5: Solve for x
    x = 23,905,963.46/5,721.20
  6. Step 6: Final answer
    x = 4,178.49

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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.