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Finding the Fourth Proportional to 14,842.19, 20,481.86 and 8,128.10

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Solution

The fourth proportional to 14,842.19, 20,481.86 and 8,128.10 is: 11,216.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,842.19 : 20,481.86 = 8,128.10 : x
  2. Step 2: Convert to fraction form
    14,842.19/20,481.86 = 8,128.10/x
  3. Step 3: Cross multiply
    14,842.19x = 20,481.86 × 8,128.10
  4. Step 4: Simplify right side
    14,842.19x = 166,478,606.27
  5. Step 5: Solve for x
    x = 166,478,606.27/14,842.19
  6. Step 6: Final answer
    x = 11,216.58

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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.