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Finding the Fourth Proportional to 21,433.20, 32,149.80 and 19,489.20

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Solution

The fourth proportional to 21,433.20, 32,149.80 and 19,489.20 is: 29,233.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,433.20 : 32,149.80 = 19,489.20 : x
  2. Step 2: Convert to fraction form
    21,433.20/32,149.80 = 19,489.20/x
  3. Step 3: Cross multiply
    21,433.20x = 32,149.80 × 19,489.20
  4. Step 4: Simplify right side
    21,433.20x = 626,573,882.16
  5. Step 5: Solve for x
    x = 626,573,882.16/21,433.20
  6. Step 6: Final answer
    x = 29,233.80

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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.