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Finding the Fourth Proportional to 20,796.69, 28,691.28 and 12,825.09

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Solution

The fourth proportional to 20,796.69, 28,691.28 and 12,825.09 is: 17,693.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,796.69 : 28,691.28 = 12,825.09 : x
  2. Step 2: Convert to fraction form
    20,796.69/28,691.28 = 12,825.09/x
  3. Step 3: Cross multiply
    20,796.69x = 28,691.28 × 12,825.09
  4. Step 4: Simplify right side
    20,796.69x = 367,968,248.22
  5. Step 5: Solve for x
    x = 367,968,248.22/20,796.69
  6. Step 6: Final answer
    x = 17,693.60

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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.