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Finding the Fourth Proportional to 88,643.70, 122,845.81 and 86,961.53

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Solution

The fourth proportional to 88,643.70, 122,845.81 and 86,961.53 is: 120,514.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    88,643.70 : 122,845.81 = 86,961.53 : x
  2. Step 2: Convert to fraction form
    88,643.70/122,845.81 = 86,961.53/x
  3. Step 3: Cross multiply
    88,643.70x = 122,845.81 × 86,961.53
  4. Step 4: Simplify right side
    88,643.70x = 10,682,859,501.98
  5. Step 5: Solve for x
    x = 10,682,859,501.98/88,643.70
  6. Step 6: Final answer
    x = 120,514.60

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.