Home / 21,121.12-29,145.17-12,621.55

Finding the Fourth Proportional to 21,121.12, 29,145.17 and 12,621.55

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Solution

The fourth proportional to 21,121.12, 29,145.17 and 12,621.55 is: 17,416.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,121.12 : 29,145.17 = 12,621.55 : x
  2. Step 2: Convert to fraction form
    21,121.12/29,145.17 = 12,621.55/x
  3. Step 3: Cross multiply
    21,121.12x = 29,145.17 × 12,621.55
  4. Step 4: Simplify right side
    21,121.12x = 367,857,217.40
  5. Step 5: Solve for x
    x = 367,857,217.40/21,121.12
  6. Step 6: Final answer
    x = 17,416.56

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.