Home / 21,721.92-29,976.90-12,290.28

Finding the Fourth Proportional to 21,721.92, 29,976.90 and 12,290.28

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Solution

The fourth proportional to 21,721.92, 29,976.90 and 12,290.28 is: 16,960.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,721.92 : 29,976.90 = 12,290.28 : x
  2. Step 2: Convert to fraction form
    21,721.92/29,976.90 = 12,290.28/x
  3. Step 3: Cross multiply
    21,721.92x = 29,976.90 × 12,290.28
  4. Step 4: Simplify right side
    21,721.92x = 368,424,494.53
  5. Step 5: Solve for x
    x = 368,424,494.53/21,721.92
  6. Step 6: Final answer
    x = 16,960.95

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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.