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Finding the Fourth Proportional to 217,719.64, 300,436.52 and 122,207.88

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Solution

The fourth proportional to 217,719.64, 300,436.52 and 122,207.88 is: 168,637.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    217,719.64 : 300,436.52 = 122,207.88 : x
  2. Step 2: Convert to fraction form
    217,719.64/300,436.52 = 122,207.88/x
  3. Step 3: Cross multiply
    217,719.64x = 300,436.52 × 122,207.88
  4. Step 4: Simplify right side
    217,719.64x = 36,715,710,183.78
  5. Step 5: Solve for x
    x = 36,715,710,183.78/217,719.64
  6. Step 6: Final answer
    x = 168,637.57

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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.