Home / 21,239.80-29,311.02-13,286.68

Finding the Fourth Proportional to 21,239.80, 29,311.02 and 13,286.68

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Solution

The fourth proportional to 21,239.80, 29,311.02 and 13,286.68 is: 18,335.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,239.80 : 29,311.02 = 13,286.68 : x
  2. Step 2: Convert to fraction form
    21,239.80/29,311.02 = 13,286.68/x
  3. Step 3: Cross multiply
    21,239.80x = 29,311.02 × 13,286.68
  4. Step 4: Simplify right side
    21,239.80x = 389,446,143.21
  5. Step 5: Solve for x
    x = 389,446,143.21/21,239.80
  6. Step 6: Final answer
    x = 18,335.68

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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.