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Finding the Fourth Proportional to 86,003.82, 128,671.92 and 75,394.02

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Solution

The fourth proportional to 86,003.82, 128,671.92 and 75,394.02 is: 112,798.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,003.82 : 128,671.92 = 75,394.02 : x
  2. Step 2: Convert to fraction form
    86,003.82/128,671.92 = 75,394.02/x
  3. Step 3: Cross multiply
    86,003.82x = 128,671.92 × 75,394.02
  4. Step 4: Simplify right side
    86,003.82x = 9,701,093,309.92
  5. Step 5: Solve for x
    x = 9,701,093,309.92/86,003.82
  6. Step 6: Final answer
    x = 112,798.40

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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.