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Finding the Fourth Proportional to 217,181.74, 299,722.80 and 121,719.19

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Solution

The fourth proportional to 217,181.74, 299,722.80 and 121,719.19 is: 167,979.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    217,181.74 : 299,722.80 = 121,719.19 : x
  2. Step 2: Convert to fraction form
    217,181.74/299,722.80 = 121,719.19/x
  3. Step 3: Cross multiply
    217,181.74x = 299,722.80 × 121,719.19
  4. Step 4: Simplify right side
    217,181.74x = 36,482,016,440.53
  5. Step 5: Solve for x
    x = 36,482,016,440.53/217,181.74
  6. Step 6: Final answer
    x = 167,979.21

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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.