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Finding the Fourth Proportional to 85,716.70, 128,608.86 and 26,556.97

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Solution

The fourth proportional to 85,716.70, 128,608.86 and 26,556.97 is: 39,845.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,716.70 : 128,608.86 = 26,556.97 : x
  2. Step 2: Convert to fraction form
    85,716.70/128,608.86 = 26,556.97/x
  3. Step 3: Cross multiply
    85,716.70x = 128,608.86 × 26,556.97
  4. Step 4: Simplify right side
    85,716.70x = 3,415,461,636.75
  5. Step 5: Solve for x
    x = 3,415,461,636.75/85,716.70
  6. Step 6: Final answer
    x = 39,845.93

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.