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Finding the Fourth Proportional to 20,838.80, 28,756.80 and 11,889.16

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Solution

The fourth proportional to 20,838.80, 28,756.80 and 11,889.16 is: 16,406.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,838.80 : 28,756.80 = 11,889.16 : x
  2. Step 2: Convert to fraction form
    20,838.80/28,756.80 = 11,889.16/x
  3. Step 3: Cross multiply
    20,838.80x = 28,756.80 × 11,889.16
  4. Step 4: Simplify right side
    20,838.80x = 341,894,196.29
  5. Step 5: Solve for x
    x = 341,894,196.29/20,838.80
  6. Step 6: Final answer
    x = 16,406.62

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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.