Home / 68,519.48-102,790.31-21,123.49

Finding the Fourth Proportional to 68,519.48, 102,790.31 and 21,123.49

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Solution

The fourth proportional to 68,519.48, 102,790.31 and 21,123.49 is: 31,688.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,519.48 : 102,790.31 = 21,123.49 : x
  2. Step 2: Convert to fraction form
    68,519.48/102,790.31 = 21,123.49/x
  3. Step 3: Cross multiply
    68,519.48x = 102,790.31 × 21,123.49
  4. Step 4: Simplify right side
    68,519.48x = 2,171,290,085.38
  5. Step 5: Solve for x
    x = 2,171,290,085.38/68,519.48
  6. Step 6: Final answer
    x = 31,688.65

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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.