Home / 15,479.28-21,361.43-8,405.70

Finding the Fourth Proportional to 15,479.28, 21,361.43 and 8,405.70

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Solution

The fourth proportional to 15,479.28, 21,361.43 and 8,405.70 is: 11,599.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,479.28 : 21,361.43 = 8,405.70 : x
  2. Step 2: Convert to fraction form
    15,479.28/21,361.43 = 8,405.70/x
  3. Step 3: Cross multiply
    15,479.28x = 21,361.43 × 8,405.70
  4. Step 4: Simplify right side
    15,479.28x = 179,557,772.15
  5. Step 5: Solve for x
    x = 179,557,772.15/15,479.28
  6. Step 6: Final answer
    x = 11,599.88

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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.