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Finding the Fourth Proportional to 20,436.84, 30,669.84 and 8,758.44

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Solution

The fourth proportional to 20,436.84, 30,669.84 and 8,758.44 is: 13,143.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,436.84 : 30,669.84 = 8,758.44 : x
  2. Step 2: Convert to fraction form
    20,436.84/30,669.84 = 8,758.44/x
  3. Step 3: Cross multiply
    20,436.84x = 30,669.84 × 8,758.44
  4. Step 4: Simplify right side
    20,436.84x = 268,619,953.45
  5. Step 5: Solve for x
    x = 268,619,953.45/20,436.84
  6. Step 6: Final answer
    x = 13,143.91

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.