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Finding the Fourth Proportional to 87,620.76, 120,874.50 and 57,393

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Solution

The fourth proportional to 87,620.76, 120,874.50 and 57,393 is: 79,174.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,620.76 : 120,874.50 = 57,393 : x
  2. Step 2: Convert to fraction form
    87,620.76/120,874.50 = 57,393/x
  3. Step 3: Cross multiply
    87,620.76x = 120,874.50 × 57,393
  4. Step 4: Simplify right side
    87,620.76x = 6,937,350,178.50
  5. Step 5: Solve for x
    x = 6,937,350,178.50/87,620.76
  6. Step 6: Final answer
    x = 79,174.73

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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.