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Finding the Fourth Proportional to 15,479.73, 21,361.84 and 8,406.20

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Solution

The fourth proportional to 15,479.73, 21,361.84 and 8,406.20 is: 11,600.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,479.73 : 21,361.84 = 8,406.20 : x
  2. Step 2: Convert to fraction form
    15,479.73/21,361.84 = 8,406.20/x
  3. Step 3: Cross multiply
    15,479.73x = 21,361.84 × 8,406.20
  4. Step 4: Simplify right side
    15,479.73x = 179,571,952.81
  5. Step 5: Solve for x
    x = 179,571,952.81/15,479.73
  6. Step 6: Final answer
    x = 11,600.46

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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.