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Finding the Fourth Proportional to 143,980.48, 198,691.68 and 79,450.30

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Solution

The fourth proportional to 143,980.48, 198,691.68 and 79,450.30 is: 109,640.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,980.48 : 198,691.68 = 79,450.30 : x
  2. Step 2: Convert to fraction form
    143,980.48/198,691.68 = 79,450.30/x
  3. Step 3: Cross multiply
    143,980.48x = 198,691.68 × 79,450.30
  4. Step 4: Simplify right side
    143,980.48x = 15,786,113,583.50
  5. Step 5: Solve for x
    x = 15,786,113,583.50/143,980.48
  6. Step 6: Final answer
    x = 109,640.65

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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.