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Finding the Fourth Proportional to 398,639.76, 550,112.64 and 217,352.04

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Solution

The fourth proportional to 398,639.76, 550,112.64 and 217,352.04 is: 299,940.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,639.76 : 550,112.64 = 217,352.04 : x
  2. Step 2: Convert to fraction form
    398,639.76/550,112.64 = 217,352.04/x
  3. Step 3: Cross multiply
    398,639.76x = 550,112.64 × 217,352.04
  4. Step 4: Simplify right side
    398,639.76x = 119,568,104,533.79
  5. Step 5: Solve for x
    x = 119,568,104,533.79/398,639.76
  6. Step 6: Final answer
    x = 299,940.24

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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.