Home / 21,222.18-29,286.90-12,838.68

Finding the Fourth Proportional to 21,222.18, 29,286.90 and 12,838.68

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Solution

The fourth proportional to 21,222.18, 29,286.90 and 12,838.68 is: 17,717.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,222.18 : 29,286.90 = 12,838.68 : x
  2. Step 2: Convert to fraction form
    21,222.18/29,286.90 = 12,838.68/x
  3. Step 3: Cross multiply
    21,222.18x = 29,286.90 × 12,838.68
  4. Step 4: Simplify right side
    21,222.18x = 376,005,137.29
  5. Step 5: Solve for x
    x = 376,005,137.29/21,222.18
  6. Step 6: Final answer
    x = 17,717.55

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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.