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Finding the Fourth Proportional to 21,989.28, 32,978.88 and 7,194.08

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Solution

The fourth proportional to 21,989.28, 32,978.88 and 7,194.08 is: 10,789.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,989.28 : 32,978.88 = 7,194.08 : x
  2. Step 2: Convert to fraction form
    21,989.28/32,978.88 = 7,194.08/x
  3. Step 3: Cross multiply
    21,989.28x = 32,978.88 × 7,194.08
  4. Step 4: Simplify right side
    21,989.28x = 237,252,701.03
  5. Step 5: Solve for x
    x = 237,252,701.03/21,989.28
  6. Step 6: Final answer
    x = 10,789.47

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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.