Home / 138,010.05-207,136.58-81,779.85

Finding the Fourth Proportional to 138,010.05, 207,136.58 and 81,779.85

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Solution

The fourth proportional to 138,010.05, 207,136.58 and 81,779.85 is: 122,741.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,010.05 : 207,136.58 = 81,779.85 : x
  2. Step 2: Convert to fraction form
    138,010.05/207,136.58 = 81,779.85/x
  3. Step 3: Cross multiply
    138,010.05x = 207,136.58 × 81,779.85
  4. Step 4: Simplify right side
    138,010.05x = 16,939,598,033.01
  5. Step 5: Solve for x
    x = 16,939,598,033.01/138,010.05
  6. Step 6: Final answer
    x = 122,741.77

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.