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Finding the Fourth Proportional to 217,912.52, 300,712.32 and 121,115.90

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Solution

The fourth proportional to 217,912.52, 300,712.32 and 121,115.90 is: 167,136.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    217,912.52 : 300,712.32 = 121,115.90 : x
  2. Step 2: Convert to fraction form
    217,912.52/300,712.32 = 121,115.90/x
  3. Step 3: Cross multiply
    217,912.52x = 300,712.32 × 121,115.90
  4. Step 4: Simplify right side
    217,912.52x = 36,421,043,277.89
  5. Step 5: Solve for x
    x = 36,421,043,277.89/217,912.52
  6. Step 6: Final answer
    x = 167,136.07

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.