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Finding the Fourth Proportional to 213,879.72, 320,639.13 and 134,819.67

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Solution

The fourth proportional to 213,879.72, 320,639.13 and 134,819.67 is: 202,115.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    213,879.72 : 320,639.13 = 134,819.67 : x
  2. Step 2: Convert to fraction form
    213,879.72/320,639.13 = 134,819.67/x
  3. Step 3: Cross multiply
    213,879.72x = 320,639.13 × 134,819.67
  4. Step 4: Simplify right side
    213,879.72x = 43,228,461,695.69
  5. Step 5: Solve for x
    x = 43,228,461,695.69/213,879.72
  6. Step 6: Final answer
    x = 202,115.76

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1.5x scale

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.