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Finding the Fourth Proportional to 20,836.52, 28,755.08 and 11,405.08

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Solution

The fourth proportional to 20,836.52, 28,755.08 and 11,405.08 is: 15,739.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,836.52 : 28,755.08 = 11,405.08 : x
  2. Step 2: Convert to fraction form
    20,836.52/28,755.08 = 11,405.08/x
  3. Step 3: Cross multiply
    20,836.52x = 28,755.08 × 11,405.08
  4. Step 4: Simplify right side
    20,836.52x = 327,953,987.81
  5. Step 5: Solve for x
    x = 327,953,987.81/20,836.52
  6. Step 6: Final answer
    x = 15,739.38

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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.