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Finding the Fourth Proportional to 38,487.20, 57,739.20 and 21,855.20

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Solution

The fourth proportional to 38,487.20, 57,739.20 and 21,855.20 is: 32,787.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,487.20 : 57,739.20 = 21,855.20 : x
  2. Step 2: Convert to fraction form
    38,487.20/57,739.20 = 21,855.20/x
  3. Step 3: Cross multiply
    38,487.20x = 57,739.20 × 21,855.20
  4. Step 4: Simplify right side
    38,487.20x = 1,261,901,763.84
  5. Step 5: Solve for x
    x = 1,261,901,763.84/38,487.20
  6. Step 6: Final answer
    x = 32,787.57

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.