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Finding the Fourth Proportional to 90,764.70, 136,046.14 and 68,505.90

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Solution

The fourth proportional to 90,764.70, 136,046.14 and 68,505.90 is: 102,682.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,764.70 : 136,046.14 = 68,505.90 : x
  2. Step 2: Convert to fraction form
    90,764.70/136,046.14 = 68,505.90/x
  3. Step 3: Cross multiply
    90,764.70x = 136,046.14 × 68,505.90
  4. Step 4: Simplify right side
    90,764.70x = 9,319,963,262.23
  5. Step 5: Solve for x
    x = 9,319,963,262.23/90,764.70
  6. Step 6: Final answer
    x = 102,682.69

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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.