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Finding the Fourth Proportional to 156,930.11, 216,561 and 85,311.94

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Solution

The fourth proportional to 156,930.11, 216,561 and 85,311.94 is: 117,729.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    156,930.11 : 216,561 = 85,311.94 : x
  2. Step 2: Convert to fraction form
    156,930.11/216,561 = 85,311.94/x
  3. Step 3: Cross multiply
    156,930.11x = 216,561 × 85,311.94
  4. Step 4: Simplify right side
    156,930.11x = 18,475,238,496.94
  5. Step 5: Solve for x
    x = 18,475,238,496.94/156,930.11
  6. Step 6: Final answer
    x = 117,729.08

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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.