Home / 21,247.83-29,320.85-11,815.78

Finding the Fourth Proportional to 21,247.83, 29,320.85 and 11,815.78

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Solution

The fourth proportional to 21,247.83, 29,320.85 and 11,815.78 is: 16,305.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,247.83 : 29,320.85 = 11,815.78 : x
  2. Step 2: Convert to fraction form
    21,247.83/29,320.85 = 11,815.78/x
  3. Step 3: Cross multiply
    21,247.83x = 29,320.85 × 11,815.78
  4. Step 4: Simplify right side
    21,247.83x = 346,448,713.01
  5. Step 5: Solve for x
    x = 346,448,713.01/21,247.83
  6. Step 6: Final answer
    x = 16,305.13

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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.