Home / 120,890.10-166,455.09-100,499.70

Finding the Fourth Proportional to 120,890.10, 166,455.09 and 100,499.70

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Solution

The fourth proportional to 120,890.10, 166,455.09 and 100,499.70 is: 138,379.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,890.10 : 166,455.09 = 100,499.70 : x
  2. Step 2: Convert to fraction form
    120,890.10/166,455.09 = 100,499.70/x
  3. Step 3: Cross multiply
    120,890.10x = 166,455.09 × 100,499.70
  4. Step 4: Simplify right side
    120,890.10x = 16,728,686,608.47
  5. Step 5: Solve for x
    x = 16,728,686,608.47/120,890.10
  6. Step 6: Final answer
    x = 138,379.29

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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.