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Finding the Fourth Proportional to 20,861.32, 28,792.02 and 11,909.20

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Solution

The fourth proportional to 20,861.32, 28,792.02 and 11,909.20 is: 16,436.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,861.32 : 28,792.02 = 11,909.20 : x
  2. Step 2: Convert to fraction form
    20,861.32/28,792.02 = 11,909.20/x
  3. Step 3: Cross multiply
    20,861.32x = 28,792.02 × 11,909.20
  4. Step 4: Simplify right side
    20,861.32x = 342,889,924.58
  5. Step 5: Solve for x
    x = 342,889,924.58/20,861.32
  6. Step 6: Final answer
    x = 16,436.64

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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.