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Finding the Fourth Proportional to 66,741.71, 100,115.89 and 19,990.13

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Solution

The fourth proportional to 66,741.71, 100,115.89 and 19,990.13 is: 29,986.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,741.71 : 100,115.89 = 19,990.13 : x
  2. Step 2: Convert to fraction form
    66,741.71/100,115.89 = 19,990.13/x
  3. Step 3: Cross multiply
    66,741.71x = 100,115.89 × 19,990.13
  4. Step 4: Simplify right side
    66,741.71x = 2,001,329,105.61
  5. Step 5: Solve for x
    x = 2,001,329,105.61/66,741.71
  6. Step 6: Final answer
    x = 29,986.18

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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.