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Finding the Fourth Proportional to 20,880.84, 28,815.84 and 11,449.38

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Solution

The fourth proportional to 20,880.84, 28,815.84 and 11,449.38 is: 15,800.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,880.84 : 28,815.84 = 11,449.38 : x
  2. Step 2: Convert to fraction form
    20,880.84/28,815.84 = 11,449.38/x
  3. Step 3: Cross multiply
    20,880.84x = 28,815.84 × 11,449.38
  4. Step 4: Simplify right side
    20,880.84x = 329,923,502.18
  5. Step 5: Solve for x
    x = 329,923,502.18/20,880.84
  6. Step 6: Final answer
    x = 15,800.30

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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.