Home / 15,479.38-21,361.56-8,405.80

Finding the Fourth Proportional to 15,479.38, 21,361.56 and 8,405.80

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Solution

The fourth proportional to 15,479.38, 21,361.56 and 8,405.80 is: 11,600.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,479.38 : 21,361.56 = 8,405.80 : x
  2. Step 2: Convert to fraction form
    15,479.38/21,361.56 = 8,405.80/x
  3. Step 3: Cross multiply
    15,479.38x = 21,361.56 × 8,405.80
  4. Step 4: Simplify right side
    15,479.38x = 179,561,001.05
  5. Step 5: Solve for x
    x = 179,561,001.05/15,479.38
  6. Step 6: Final answer
    x = 11,600.01

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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.