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Finding the Fourth Proportional to 20,999.64, 28,979.50 and 11,568.21

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Solution

The fourth proportional to 20,999.64, 28,979.50 and 11,568.21 is: 15,964.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,999.64 : 28,979.50 = 11,568.21 : x
  2. Step 2: Convert to fraction form
    20,999.64/28,979.50 = 11,568.21/x
  3. Step 3: Cross multiply
    20,999.64x = 28,979.50 × 11,568.21
  4. Step 4: Simplify right side
    20,999.64x = 335,240,941.70
  5. Step 5: Solve for x
    x = 335,240,941.70/20,999.64
  6. Step 6: Final answer
    x = 15,964.13

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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.