Home / 21,721.25-29,975.36-12,289.61

Finding the Fourth Proportional to 21,721.25, 29,975.36 and 12,289.61

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Solution

The fourth proportional to 21,721.25, 29,975.36 and 12,289.61 is: 16,959.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,721.25 : 29,975.36 = 12,289.61 : x
  2. Step 2: Convert to fraction form
    21,721.25/29,975.36 = 12,289.61/x
  3. Step 3: Cross multiply
    21,721.25x = 29,975.36 × 12,289.61
  4. Step 4: Simplify right side
    21,721.25x = 368,385,422.56
  5. Step 5: Solve for x
    x = 368,385,422.56/21,721.25
  6. Step 6: Final answer
    x = 16,959.68

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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.