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Finding the Fourth Proportional to 15,121.71, 20,867.54 and 8,406.86

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Solution

The fourth proportional to 15,121.71, 20,867.54 and 8,406.86 is: 11,601.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,121.71 : 20,867.54 = 8,406.86 : x
  2. Step 2: Convert to fraction form
    15,121.71/20,867.54 = 8,406.86/x
  3. Step 3: Cross multiply
    15,121.71x = 20,867.54 × 8,406.86
  4. Step 4: Simplify right side
    15,121.71x = 175,430,340.95
  5. Step 5: Solve for x
    x = 175,430,340.95/15,121.71
  6. Step 6: Final answer
    x = 11,601.22

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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.