Home / 21,231.20-29,284.80-13,687.13

Finding the Fourth Proportional to 21,231.20, 29,284.80 and 13,687.13

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Solution

The fourth proportional to 21,231.20, 29,284.80 and 13,687.13 is: 18,879.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,231.20 : 29,284.80 = 13,687.13 : x
  2. Step 2: Convert to fraction form
    21,231.20/29,284.80 = 13,687.13/x
  3. Step 3: Cross multiply
    21,231.20x = 29,284.80 × 13,687.13
  4. Step 4: Simplify right side
    21,231.20x = 400,824,864.62
  5. Step 5: Solve for x
    x = 400,824,864.62/21,231.20
  6. Step 6: Final answer
    x = 18,879.05

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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.