Home / 15,436.80-21,301.20-8,721.90

Finding the Fourth Proportional to 15,436.80, 21,301.20 and 8,721.90

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Solution

The fourth proportional to 15,436.80, 21,301.20 and 8,721.90 is: 12,035.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,436.80 : 21,301.20 = 8,721.90 : x
  2. Step 2: Convert to fraction form
    15,436.80/21,301.20 = 8,721.90/x
  3. Step 3: Cross multiply
    15,436.80x = 21,301.20 × 8,721.90
  4. Step 4: Simplify right side
    15,436.80x = 185,786,936.28
  5. Step 5: Solve for x
    x = 185,786,936.28/15,436.80
  6. Step 6: Final answer
    x = 12,035.33

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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.