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Finding the Fourth Proportional to 13,663.68, 20,479.68 and 7,418.88

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Solution

The fourth proportional to 13,663.68, 20,479.68 and 7,418.88 is: 11,119.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,663.68 : 20,479.68 = 7,418.88 : x
  2. Step 2: Convert to fraction form
    13,663.68/20,479.68 = 7,418.88/x
  3. Step 3: Cross multiply
    13,663.68x = 20,479.68 × 7,418.88
  4. Step 4: Simplify right side
    13,663.68x = 151,936,288.36
  5. Step 5: Solve for x
    x = 151,936,288.36/13,663.68
  6. Step 6: Final answer
    x = 11,119.72

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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.