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Finding the Fourth Proportional to 21,008.64, 28,993.60 and 11,578.80

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Solution

The fourth proportional to 21,008.64, 28,993.60 and 11,578.80 is: 15,979.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,008.64 : 28,993.60 = 11,578.80 : x
  2. Step 2: Convert to fraction form
    21,008.64/28,993.60 = 11,578.80/x
  3. Step 3: Cross multiply
    21,008.64x = 28,993.60 × 11,578.80
  4. Step 4: Simplify right side
    21,008.64x = 335,711,095.68
  5. Step 5: Solve for x
    x = 335,711,095.68/21,008.64
  6. Step 6: Final answer
    x = 15,979.67

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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.