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Finding the Fourth Proportional to 56,939.20, 85,408.80 and 38,276.80

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Solution

The fourth proportional to 56,939.20, 85,408.80 and 38,276.80 is: 57,415.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    56,939.20 : 85,408.80 = 38,276.80 : x
  2. Step 2: Convert to fraction form
    56,939.20/85,408.80 = 38,276.80/x
  3. Step 3: Cross multiply
    56,939.20x = 85,408.80 × 38,276.80
  4. Step 4: Simplify right side
    56,939.20x = 3,269,175,555.84
  5. Step 5: Solve for x
    x = 3,269,175,555.84/56,939.20
  6. Step 6: Final answer
    x = 57,415.20

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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.