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Finding the Fourth Proportional to 21,718.32, 32,578.20 and 6,928.08

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Solution

The fourth proportional to 21,718.32, 32,578.20 and 6,928.08 is: 10,392.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,718.32 : 32,578.20 = 6,928.08 : x
  2. Step 2: Convert to fraction form
    21,718.32/32,578.20 = 6,928.08/x
  3. Step 3: Cross multiply
    21,718.32x = 32,578.20 × 6,928.08
  4. Step 4: Simplify right side
    21,718.32x = 225,704,375.86
  5. Step 5: Solve for x
    x = 225,704,375.86/21,718.32
  6. Step 6: Final answer
    x = 10,392.35

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.