Home / 21,118.34-29,143.14-11,687.42

Finding the Fourth Proportional to 21,118.34, 29,143.14 and 11,687.42

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Solution

The fourth proportional to 21,118.34, 29,143.14 and 11,687.42 is: 16,128.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,118.34 : 29,143.14 = 11,687.42 : x
  2. Step 2: Convert to fraction form
    21,118.34/29,143.14 = 11,687.42/x
  3. Step 3: Cross multiply
    21,118.34x = 29,143.14 × 11,687.42
  4. Step 4: Simplify right side
    21,118.34x = 340,608,117.30
  5. Step 5: Solve for x
    x = 340,608,117.30/21,118.34
  6. Step 6: Final answer
    x = 16,128.55

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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.