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Finding the Fourth Proportional to 20,871.81, 28,803.06 and 11,440.44

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Solution

The fourth proportional to 20,871.81, 28,803.06 and 11,440.44 is: 15,787.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,871.81 : 28,803.06 = 11,440.44 : x
  2. Step 2: Convert to fraction form
    20,871.81/28,803.06 = 11,440.44/x
  3. Step 3: Cross multiply
    20,871.81x = 28,803.06 × 11,440.44
  4. Step 4: Simplify right side
    20,871.81x = 329,519,679.75
  5. Step 5: Solve for x
    x = 329,519,679.75/20,871.81
  6. Step 6: Final answer
    x = 15,787.79

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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.