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Finding the Fourth Proportional to 20,959.21, 28,923.15 and 11,886.24

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Solution

The fourth proportional to 20,959.21, 28,923.15 and 11,886.24 is: 16,402.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,959.21 : 28,923.15 = 11,886.24 : x
  2. Step 2: Convert to fraction form
    20,959.21/28,923.15 = 11,886.24/x
  3. Step 3: Cross multiply
    20,959.21x = 28,923.15 × 11,886.24
  4. Step 4: Simplify right side
    20,959.21x = 343,787,502.46
  5. Step 5: Solve for x
    x = 343,787,502.46/20,959.21
  6. Step 6: Final answer
    x = 16,402.69

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.