Home / 15,380.17-21,219.91-9,405.61

Finding the Fourth Proportional to 15,380.17, 21,219.91 and 9,405.61

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Solution

The fourth proportional to 15,380.17, 21,219.91 and 9,405.61 is: 12,976.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,380.17 : 21,219.91 = 9,405.61 : x
  2. Step 2: Convert to fraction form
    15,380.17/21,219.91 = 9,405.61/x
  3. Step 3: Cross multiply
    15,380.17x = 21,219.91 × 9,405.61
  4. Step 4: Simplify right side
    15,380.17x = 199,586,121.13
  5. Step 5: Solve for x
    x = 199,586,121.13/15,380.17
  6. Step 6: Final answer
    x = 12,976.85

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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.