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Finding the Fourth Proportional to 20,661.56, 30,915.78 and 12,346.10

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Solution

The fourth proportional to 20,661.56, 30,915.78 and 12,346.10 is: 18,473.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,661.56 : 30,915.78 = 12,346.10 : x
  2. Step 2: Convert to fraction form
    20,661.56/30,915.78 = 12,346.10/x
  3. Step 3: Cross multiply
    20,661.56x = 30,915.78 × 12,346.10
  4. Step 4: Simplify right side
    20,661.56x = 381,689,311.46
  5. Step 5: Solve for x
    x = 381,689,311.46/20,661.56
  6. Step 6: Final answer
    x = 18,473.40

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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.