Home / 142,112.78-196,115.90-78,450.65

Finding the Fourth Proportional to 142,112.78, 196,115.90 and 78,450.65

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Solution

The fourth proportional to 142,112.78, 196,115.90 and 78,450.65 is: 108,262.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    142,112.78 : 196,115.90 = 78,450.65 : x
  2. Step 2: Convert to fraction form
    142,112.78/196,115.90 = 78,450.65/x
  3. Step 3: Cross multiply
    142,112.78x = 196,115.90 × 78,450.65
  4. Step 4: Simplify right side
    142,112.78x = 15,385,419,830.34
  5. Step 5: Solve for x
    x = 15,385,419,830.34/142,112.78
  6. Step 6: Final answer
    x = 108,262.04

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1.5x scale

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.