Home / 21,175.71-29,203.38-13,218.68

Finding the Fourth Proportional to 21,175.71, 29,203.38 and 13,218.68

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Solution

The fourth proportional to 21,175.71, 29,203.38 and 13,218.68 is: 18,229.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,175.71 : 29,203.38 = 13,218.68 : x
  2. Step 2: Convert to fraction form
    21,175.71/29,203.38 = 13,218.68/x
  3. Step 3: Cross multiply
    21,175.71x = 29,203.38 × 13,218.68
  4. Step 4: Simplify right side
    21,175.71x = 386,029,989.12
  5. Step 5: Solve for x
    x = 386,029,989.12/21,175.71
  6. Step 6: Final answer
    x = 18,229.85

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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.