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Finding the Fourth Proportional to 20,999.26, 28,978.58 and 11,567.62

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Solution

The fourth proportional to 20,999.26, 28,978.58 and 11,567.62 is: 15,963.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,999.26 : 28,978.58 = 11,567.62 : x
  2. Step 2: Convert to fraction form
    20,999.26/28,978.58 = 11,567.62/x
  3. Step 3: Cross multiply
    20,999.26x = 28,978.58 × 11,567.62
  4. Step 4: Simplify right side
    20,999.26x = 335,213,201.58
  5. Step 5: Solve for x
    x = 335,213,201.58/20,999.26
  6. Step 6: Final answer
    x = 15,963.10

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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.