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Finding the Fourth Proportional to 13,878.92, 20,818.02 and 6,479.30

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Solution

The fourth proportional to 13,878.92, 20,818.02 and 6,479.30 is: 9,718.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,878.92 : 20,818.02 = 6,479.30 : x
  2. Step 2: Convert to fraction form
    13,878.92/20,818.02 = 6,479.30/x
  3. Step 3: Cross multiply
    13,878.92x = 20,818.02 × 6,479.30
  4. Step 4: Simplify right side
    13,878.92x = 134,886,196.99
  5. Step 5: Solve for x
    x = 134,886,196.99/13,878.92
  6. Step 6: Final answer
    x = 9,718.78

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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.