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Finding the Fourth Proportional to 21,478.99, 32,218.20 and 6,687.85

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Solution

The fourth proportional to 21,478.99, 32,218.20 and 6,687.85 is: 10,031.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,478.99 : 32,218.20 = 6,687.85 : x
  2. Step 2: Convert to fraction form
    21,478.99/32,218.20 = 6,687.85/x
  3. Step 3: Cross multiply
    21,478.99x = 32,218.20 × 6,687.85
  4. Step 4: Simplify right side
    21,478.99x = 215,470,488.87
  5. Step 5: Solve for x
    x = 215,470,488.87/21,478.99
  6. Step 6: Final answer
    x = 10,031.69

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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.