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Finding the Fourth Proportional to 21,198.60, 31,797.90 and 19,643.40

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Solution

The fourth proportional to 21,198.60, 31,797.90 and 19,643.40 is: 29,465.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,198.60 : 31,797.90 = 19,643.40 : x
  2. Step 2: Convert to fraction form
    21,198.60/31,797.90 = 19,643.40/x
  3. Step 3: Cross multiply
    21,198.60x = 31,797.90 × 19,643.40
  4. Step 4: Simplify right side
    21,198.60x = 624,618,868.86
  5. Step 5: Solve for x
    x = 624,618,868.86/21,198.60
  6. Step 6: Final answer
    x = 29,465.10

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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.