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Finding the Fourth Proportional to 87,318, 120,518.28 and 55,480.68

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Solution

The fourth proportional to 87,318, 120,518.28 and 55,480.68 is: 76,575.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,318 : 120,518.28 = 55,480.68 : x
  2. Step 2: Convert to fraction form
    87,318/120,518.28 = 55,480.68/x
  3. Step 3: Cross multiply
    87,318x = 120,518.28 × 55,480.68
  4. Step 4: Simplify right side
    87,318x = 6,686,436,126.83
  5. Step 5: Solve for x
    x = 6,686,436,126.83/87,318
  6. Step 6: Final answer
    x = 76,575.69

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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.