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Finding the Fourth Proportional to 159,311.81, 219,850.30 and 87,691.51

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Solution

The fourth proportional to 159,311.81, 219,850.30 and 87,691.51 is: 121,014.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    159,311.81 : 219,850.30 = 87,691.51 : x
  2. Step 2: Convert to fraction form
    159,311.81/219,850.30 = 87,691.51/x
  3. Step 3: Cross multiply
    159,311.81x = 219,850.30 × 87,691.51
  4. Step 4: Simplify right side
    159,311.81x = 19,279,005,165.38
  5. Step 5: Solve for x
    x = 19,279,005,165.38/159,311.81
  6. Step 6: Final answer
    x = 121,014.29

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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.