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Finding the Fourth Proportional to 5,478.90, 8,208.90 and 2,551.20

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Solution

The fourth proportional to 5,478.90, 8,208.90 and 2,551.20 is: 3,822.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,478.90 : 8,208.90 = 2,551.20 : x
  2. Step 2: Convert to fraction form
    5,478.90/8,208.90 = 2,551.20/x
  3. Step 3: Cross multiply
    5,478.90x = 8,208.90 × 2,551.20
  4. Step 4: Simplify right side
    5,478.90x = 20,942,545.68
  5. Step 5: Solve for x
    x = 20,942,545.68/5,478.90
  6. Step 6: Final answer
    x = 3,822.40

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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.