Home / 21,721.14-29,976.21-12,289.50

Finding the Fourth Proportional to 21,721.14, 29,976.21 and 12,289.50

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Solution

The fourth proportional to 21,721.14, 29,976.21 and 12,289.50 is: 16,960.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,721.14 : 29,976.21 = 12,289.50 : x
  2. Step 2: Convert to fraction form
    21,721.14/29,976.21 = 12,289.50/x
  3. Step 3: Cross multiply
    21,721.14x = 29,976.21 × 12,289.50
  4. Step 4: Simplify right side
    21,721.14x = 368,392,632.80
  5. Step 5: Solve for x
    x = 368,392,632.80/21,721.14
  6. Step 6: Final answer
    x = 16,960.10

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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.