Home / 21,121.21-29,145.30-12,621.65

Finding the Fourth Proportional to 21,121.21, 29,145.30 and 12,621.65

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Solution

The fourth proportional to 21,121.21, 29,145.30 and 12,621.65 is: 17,416.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,121.21 : 29,145.30 = 12,621.65 : x
  2. Step 2: Convert to fraction form
    21,121.21/29,145.30 = 12,621.65/x
  3. Step 3: Cross multiply
    21,121.21x = 29,145.30 × 12,621.65
  4. Step 4: Simplify right side
    21,121.21x = 367,861,582.69
  5. Step 5: Solve for x
    x = 367,861,582.69/21,121.21
  6. Step 6: Final answer
    x = 17,416.69

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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.