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Finding the Fourth Proportional to 217,603.06, 326,169.16 and 91,311.91

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Solution

The fourth proportional to 217,603.06, 326,169.16 and 91,311.91 is: 136,869.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    217,603.06 : 326,169.16 = 91,311.91 : x
  2. Step 2: Convert to fraction form
    217,603.06/326,169.16 = 91,311.91/x
  3. Step 3: Cross multiply
    217,603.06x = 326,169.16 × 91,311.91
  4. Step 4: Simplify right side
    217,603.06x = 29,783,128,982.70
  5. Step 5: Solve for x
    x = 29,783,128,982.70/217,603.06
  6. Step 6: Final answer
    x = 136,869.07

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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.