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Finding the Fourth Proportional to 21,207.99, 31,762.77 and 20,469.90

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Solution

The fourth proportional to 21,207.99, 31,762.77 and 20,469.90 is: 30,657.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,207.99 : 31,762.77 = 20,469.90 : x
  2. Step 2: Convert to fraction form
    21,207.99/31,762.77 = 20,469.90/x
  3. Step 3: Cross multiply
    21,207.99x = 31,762.77 × 20,469.90
  4. Step 4: Simplify right side
    21,207.99x = 650,180,725.62
  5. Step 5: Solve for x
    x = 650,180,725.62/21,207.99
  6. Step 6: Final answer
    x = 30,657.35

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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.