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Finding the Fourth Proportional to 7,481.20, 11,221.80 and 5,148.40

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Solution

The fourth proportional to 7,481.20, 11,221.80 and 5,148.40 is: 7,722.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,481.20 : 11,221.80 = 5,148.40 : x
  2. Step 2: Convert to fraction form
    7,481.20/11,221.80 = 5,148.40/x
  3. Step 3: Cross multiply
    7,481.20x = 11,221.80 × 5,148.40
  4. Step 4: Simplify right side
    7,481.20x = 57,774,315.12
  5. Step 5: Solve for x
    x = 57,774,315.12/7,481.20
  6. Step 6: Final answer
    x = 7,722.60

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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.