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Finding the Fourth Proportional to 18,739.07, 25,861.07 and 10,781.11

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Solution

The fourth proportional to 18,739.07, 25,861.07 and 10,781.11 is: 14,878.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,739.07 : 25,861.07 = 10,781.11 : x
  2. Step 2: Convert to fraction form
    18,739.07/25,861.07 = 10,781.11/x
  3. Step 3: Cross multiply
    18,739.07x = 25,861.07 × 10,781.11
  4. Step 4: Simplify right side
    18,739.07x = 278,811,040.39
  5. Step 5: Solve for x
    x = 278,811,040.39/18,739.07
  6. Step 6: Final answer
    x = 14,878.60

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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.