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Finding the Fourth Proportional to 90,491.32, 135,483.72 and 68,235.04

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Solution

The fourth proportional to 90,491.32, 135,483.72 and 68,235.04 is: 102,161.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,491.32 : 135,483.72 = 68,235.04 : x
  2. Step 2: Convert to fraction form
    90,491.32/135,483.72 = 68,235.04/x
  3. Step 3: Cross multiply
    90,491.32x = 135,483.72 × 68,235.04
  4. Step 4: Simplify right side
    90,491.32x = 9,244,737,053.55
  5. Step 5: Solve for x
    x = 9,244,737,053.55/90,491.32
  6. Step 6: Final answer
    x = 102,161.59

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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.