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Finding the Fourth Proportional to 128,846.67, 177,755.91 and 86,418.87

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Solution

The fourth proportional to 128,846.67, 177,755.91 and 86,418.87 is: 119,222.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,846.67 : 177,755.91 = 86,418.87 : x
  2. Step 2: Convert to fraction form
    128,846.67/177,755.91 = 86,418.87/x
  3. Step 3: Cross multiply
    128,846.67x = 177,755.91 × 86,418.87
  4. Step 4: Simplify right side
    128,846.67x = 15,361,464,878.02
  5. Step 5: Solve for x
    x = 15,361,464,878.02/128,846.67
  6. Step 6: Final answer
    x = 119,222.83

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1.5x scale

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.