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Finding the Fourth Proportional to 20,796.60, 28,699.20 and 11,364.96

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Solution

The fourth proportional to 20,796.60, 28,699.20 and 11,364.96 is: 15,683.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,796.60 : 28,699.20 = 11,364.96 : x
  2. Step 2: Convert to fraction form
    20,796.60/28,699.20 = 11,364.96/x
  3. Step 3: Cross multiply
    20,796.60x = 28,699.20 × 11,364.96
  4. Step 4: Simplify right side
    20,796.60x = 326,165,260.03
  5. Step 5: Solve for x
    x = 326,165,260.03/20,796.60
  6. Step 6: Final answer
    x = 15,683.59

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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.