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Finding the Fourth Proportional to 398,639.28, 550,126.50 and 217,349.73

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Solution

The fourth proportional to 398,639.28, 550,126.50 and 217,349.73 is: 299,944.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,639.28 : 550,126.50 = 217,349.73 : x
  2. Step 2: Convert to fraction form
    398,639.28/550,126.50 = 217,349.73/x
  3. Step 3: Cross multiply
    398,639.28x = 550,126.50 × 217,349.73
  4. Step 4: Simplify right side
    398,639.28x = 119,569,846,240.85
  5. Step 5: Solve for x
    x = 119,569,846,240.85/398,639.28
  6. Step 6: Final answer
    x = 299,944.97

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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.