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Finding the Fourth Proportional to 8,838.40, 12,189.84 and 5,478.88

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Solution

The fourth proportional to 8,838.40, 12,189.84 and 5,478.88 is: 7,556.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,838.40 : 12,189.84 = 5,478.88 : x
  2. Step 2: Convert to fraction form
    8,838.40/12,189.84 = 5,478.88/x
  3. Step 3: Cross multiply
    8,838.40x = 12,189.84 × 5,478.88
  4. Step 4: Simplify right side
    8,838.40x = 66,786,670.58
  5. Step 5: Solve for x
    x = 66,786,670.58/8,838.40
  6. Step 6: Final answer
    x = 7,556.42

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.