Home / 20,719.31-31,078.94-5,136.93

Finding the Fourth Proportional to 20,719.31, 31,078.94 and 5,136.93

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Solution

The fourth proportional to 20,719.31, 31,078.94 and 5,136.93 is: 7,705.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,719.31 : 31,078.94 = 5,136.93 : x
  2. Step 2: Convert to fraction form
    20,719.31/31,078.94 = 5,136.93/x
  3. Step 3: Cross multiply
    20,719.31x = 31,078.94 × 5,136.93
  4. Step 4: Simplify right side
    20,719.31x = 159,650,313.57
  5. Step 5: Solve for x
    x = 159,650,313.57/20,719.31
  6. Step 6: Final answer
    x = 7,705.39

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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.