Home / 87,285.21-120,458.75-65,736.95

Finding the Fourth Proportional to 87,285.21, 120,458.75 and 65,736.95

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Solution

The fourth proportional to 87,285.21, 120,458.75 and 65,736.95 is: 90,720.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,285.21 : 120,458.75 = 65,736.95 : x
  2. Step 2: Convert to fraction form
    87,285.21/120,458.75 = 65,736.95/x
  3. Step 3: Cross multiply
    87,285.21x = 120,458.75 × 65,736.95
  4. Step 4: Simplify right side
    87,285.21x = 7,918,590,825.81
  5. Step 5: Solve for x
    x = 7,918,590,825.81/87,285.21
  6. Step 6: Final answer
    x = 90,720.88

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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.