Home / 5,478.40-8,212.20-2,187.10

Finding the Fourth Proportional to 5,478.40, 8,212.20 and 2,187.10

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Solution

The fourth proportional to 5,478.40, 8,212.20 and 2,187.10 is: 3,278.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,478.40 : 8,212.20 = 2,187.10 : x
  2. Step 2: Convert to fraction form
    5,478.40/8,212.20 = 2,187.10/x
  3. Step 3: Cross multiply
    5,478.40x = 8,212.20 × 2,187.10
  4. Step 4: Simplify right side
    5,478.40x = 17,960,902.62
  5. Step 5: Solve for x
    x = 17,960,902.62/5,478.40
  6. Step 6: Final answer
    x = 3,278.49

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Half scale
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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.