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Finding the Fourth Proportional to 28,448.40, 39,249.92 and 18,382.40

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Solution

The fourth proportional to 28,448.40, 39,249.92 and 18,382.40 is: 25,361.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,448.40 : 39,249.92 = 18,382.40 : x
  2. Step 2: Convert to fraction form
    28,448.40/39,249.92 = 18,382.40/x
  3. Step 3: Cross multiply
    28,448.40x = 39,249.92 × 18,382.40
  4. Step 4: Simplify right side
    28,448.40x = 721,507,729.41
  5. Step 5: Solve for x
    x = 721,507,729.41/28,448.40
  6. Step 6: Final answer
    x = 25,361.98

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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.