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Finding the Fourth Proportional to 21,806.88, 32,715.19 and 7,955.88

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Solution

The fourth proportional to 21,806.88, 32,715.19 and 7,955.88 is: 11,935.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,806.88 : 32,715.19 = 7,955.88 : x
  2. Step 2: Convert to fraction form
    21,806.88/32,715.19 = 7,955.88/x
  3. Step 3: Cross multiply
    21,806.88x = 32,715.19 × 7,955.88
  4. Step 4: Simplify right side
    21,806.88x = 260,278,125.82
  5. Step 5: Solve for x
    x = 260,278,125.82/21,806.88
  6. Step 6: Final answer
    x = 11,935.60

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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.