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Finding the Fourth Proportional to 217,879.20, 300,812.64 and 145,385.76

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Solution

The fourth proportional to 217,879.20, 300,812.64 and 145,385.76 is: 200,725.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    217,879.20 : 300,812.64 = 145,385.76 : x
  2. Step 2: Convert to fraction form
    217,879.20/300,812.64 = 145,385.76/x
  3. Step 3: Cross multiply
    217,879.20x = 300,812.64 × 145,385.76
  4. Step 4: Simplify right side
    217,879.20x = 43,733,874,284.01
  5. Step 5: Solve for x
    x = 43,733,874,284.01/217,879.20
  6. Step 6: Final answer
    x = 200,725.33

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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.