Home / 87,678.06-120,980.34-51,855

Finding the Fourth Proportional to 87,678.06, 120,980.34 and 51,855

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Solution

The fourth proportional to 87,678.06, 120,980.34 and 51,855 is: 71,550.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,678.06 : 120,980.34 = 51,855 : x
  2. Step 2: Convert to fraction form
    87,678.06/120,980.34 = 51,855/x
  3. Step 3: Cross multiply
    87,678.06x = 120,980.34 × 51,855
  4. Step 4: Simplify right side
    87,678.06x = 6,273,435,530.70
  5. Step 5: Solve for x
    x = 6,273,435,530.70/87,678.06
  6. Step 6: Final answer
    x = 71,550.80

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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.