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Finding the Fourth Proportional to 372,939.20, 559,408.80 and 215,475.20

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Solution

The fourth proportional to 372,939.20, 559,408.80 and 215,475.20 is: 323,212.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    372,939.20 : 559,408.80 = 215,475.20 : x
  2. Step 2: Convert to fraction form
    372,939.20/559,408.80 = 215,475.20/x
  3. Step 3: Cross multiply
    372,939.20x = 559,408.80 × 215,475.20
  4. Step 4: Simplify right side
    372,939.20x = 120,538,723,061.76
  5. Step 5: Solve for x
    x = 120,538,723,061.76/372,939.20
  6. Step 6: Final answer
    x = 323,212.80

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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.