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Finding the Fourth Proportional to 71,145.20, 106,723.20 and 21,221.39

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Solution

The fourth proportional to 71,145.20, 106,723.20 and 21,221.39 is: 31,833.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,145.20 : 106,723.20 = 21,221.39 : x
  2. Step 2: Convert to fraction form
    71,145.20/106,723.20 = 21,221.39/x
  3. Step 3: Cross multiply
    71,145.20x = 106,723.20 × 21,221.39
  4. Step 4: Simplify right side
    71,145.20x = 2,264,814,649.25
  5. Step 5: Solve for x
    x = 2,264,814,649.25/71,145.20
  6. Step 6: Final answer
    x = 31,833.70

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1.5x scale

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.