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Finding the Fourth Proportional to 85,998.54, 128,664.09 and 75,388.77

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Solution

The fourth proportional to 85,998.54, 128,664.09 and 75,388.77 is: 112,790.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,998.54 : 128,664.09 = 75,388.77 : x
  2. Step 2: Convert to fraction form
    85,998.54/128,664.09 = 75,388.77/x
  3. Step 3: Cross multiply
    85,998.54x = 128,664.09 × 75,388.77
  4. Step 4: Simplify right side
    85,998.54x = 9,699,827,488.27
  5. Step 5: Solve for x
    x = 9,699,827,488.27/85,998.54
  6. Step 6: Final answer
    x = 112,790.61

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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.