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Finding the Fourth Proportional to 20,691.25, 28,553.93 and 11,259.88

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Solution

The fourth proportional to 20,691.25, 28,553.93 and 11,259.88 is: 15,538.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,691.25 : 28,553.93 = 11,259.88 : x
  2. Step 2: Convert to fraction form
    20,691.25/28,553.93 = 11,259.88/x
  3. Step 3: Cross multiply
    20,691.25x = 28,553.93 × 11,259.88
  4. Step 4: Simplify right side
    20,691.25x = 321,513,825.33
  5. Step 5: Solve for x
    x = 321,513,825.33/20,691.25
  6. Step 6: Final answer
    x = 15,538.64

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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.