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Finding the Fourth Proportional to 90,740.60, 136,093.14 and 86,239.82

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Solution

The fourth proportional to 90,740.60, 136,093.14 and 86,239.82 is: 129,342.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,740.60 : 136,093.14 = 86,239.82 : x
  2. Step 2: Convert to fraction form
    90,740.60/136,093.14 = 86,239.82/x
  3. Step 3: Cross multiply
    90,740.60x = 136,093.14 × 86,239.82
  4. Step 4: Simplify right side
    90,740.60x = 11,736,647,896.83
  5. Step 5: Solve for x
    x = 11,736,647,896.83/90,740.60
  6. Step 6: Final answer
    x = 129,342.85

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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.