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Finding the Fourth Proportional to 14,842.49, 20,482.86 and 8,128.74

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Solution

The fourth proportional to 14,842.49, 20,482.86 and 8,128.74 is: 11,217.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,842.49 : 20,482.86 = 8,128.74 : x
  2. Step 2: Convert to fraction form
    14,842.49/20,482.86 = 8,128.74/x
  3. Step 3: Cross multiply
    14,842.49x = 20,482.86 × 8,128.74
  4. Step 4: Simplify right side
    14,842.49x = 166,499,843.40
  5. Step 5: Solve for x
    x = 166,499,843.40/14,842.49
  6. Step 6: Final answer
    x = 11,217.78

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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.