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Finding the Fourth Proportional to 66,821.38, 100,221.62 and 21,842.40

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Solution

The fourth proportional to 66,821.38, 100,221.62 and 21,842.40 is: 32,760.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,821.38 : 100,221.62 = 21,842.40 : x
  2. Step 2: Convert to fraction form
    66,821.38/100,221.62 = 21,842.40/x
  3. Step 3: Cross multiply
    66,821.38x = 100,221.62 × 21,842.40
  4. Step 4: Simplify right side
    66,821.38x = 2,189,080,712.69
  5. Step 5: Solve for x
    x = 2,189,080,712.69/66,821.38
  6. Step 6: Final answer
    x = 32,760.18

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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.