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Finding the Fourth Proportional to 398,728.17, 550,243.26 and 217,439.64

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Solution

The fourth proportional to 398,728.17, 550,243.26 and 217,439.64 is: 300,065.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,728.17 : 550,243.26 = 217,439.64 : x
  2. Step 2: Convert to fraction form
    398,728.17/550,243.26 = 217,439.64/x
  3. Step 3: Cross multiply
    398,728.17x = 550,243.26 × 217,439.64
  4. Step 4: Simplify right side
    398,728.17x = 119,644,696,366.83
  5. Step 5: Solve for x
    x = 119,644,696,366.83/398,728.17
  6. Step 6: Final answer
    x = 300,065.82

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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.