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Finding the Fourth Proportional to 217,181.40, 299,707.40 and 121,689.96

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Solution

The fourth proportional to 217,181.40, 299,707.40 and 121,689.96 is: 167,930.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    217,181.40 : 299,707.40 = 121,689.96 : x
  2. Step 2: Convert to fraction form
    217,181.40/299,707.40 = 121,689.96/x
  3. Step 3: Cross multiply
    217,181.40x = 299,707.40 × 121,689.96
  4. Step 4: Simplify right side
    217,181.40x = 36,471,381,517.70
  5. Step 5: Solve for x
    x = 36,471,381,517.70/217,181.40
  6. Step 6: Final answer
    x = 167,930.50

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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.