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Finding the Fourth Proportional to 398,718.52, 550,244.79 and 217,440.34

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Solution

The fourth proportional to 398,718.52, 550,244.79 and 217,440.34 is: 300,074.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,718.52 : 550,244.79 = 217,440.34 : x
  2. Step 2: Convert to fraction form
    398,718.52/550,244.79 = 217,440.34/x
  3. Step 3: Cross multiply
    398,718.52x = 550,244.79 × 217,440.34
  4. Step 4: Simplify right side
    398,718.52x = 119,645,414,220.83
  5. Step 5: Solve for x
    x = 119,645,414,220.83/398,718.52
  6. Step 6: Final answer
    x = 300,074.89

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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.