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Finding the Fourth Proportional to 86,971.84, 120,004.68 and 82,542.76

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Solution

The fourth proportional to 86,971.84, 120,004.68 and 82,542.76 is: 113,893.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,971.84 : 120,004.68 = 82,542.76 : x
  2. Step 2: Convert to fraction form
    86,971.84/120,004.68 = 82,542.76/x
  3. Step 3: Cross multiply
    86,971.84x = 120,004.68 × 82,542.76
  4. Step 4: Simplify right side
    86,971.84x = 9,905,517,500.12
  5. Step 5: Solve for x
    x = 9,905,517,500.12/86,971.84
  6. Step 6: Final answer
    x = 113,893.39

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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.