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Finding the Fourth Proportional to 142,103.98, 196,103.51 and 78,441.78

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Solution

The fourth proportional to 142,103.98, 196,103.51 and 78,441.78 is: 108,249.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    142,103.98 : 196,103.51 = 78,441.78 : x
  2. Step 2: Convert to fraction form
    142,103.98/196,103.51 = 78,441.78/x
  3. Step 3: Cross multiply
    142,103.98x = 196,103.51 × 78,441.78
  4. Step 4: Simplify right side
    142,103.98x = 15,382,708,388.65
  5. Step 5: Solve for x
    x = 15,382,708,388.65/142,103.98
  6. Step 6: Final answer
    x = 108,249.67

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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.