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Finding the Fourth Proportional to 20,959.71, 28,923.84 and 11,886.74

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Solution

The fourth proportional to 20,959.71, 28,923.84 and 11,886.74 is: 16,403.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,959.71 : 28,923.84 = 11,886.74 : x
  2. Step 2: Convert to fraction form
    20,959.71/28,923.84 = 11,886.74/x
  3. Step 3: Cross multiply
    20,959.71x = 28,923.84 × 11,886.74
  4. Step 4: Simplify right side
    20,959.71x = 343,810,021.26
  5. Step 5: Solve for x
    x = 343,810,021.26/20,959.71
  6. Step 6: Final answer
    x = 16,403.38

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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.