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Finding the Fourth Proportional to 398,645.28, 550,134.81 and 217,355.76

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Solution

The fourth proportional to 398,645.28, 550,134.81 and 217,355.76 is: 299,953.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,645.28 : 550,134.81 = 217,355.76 : x
  2. Step 2: Convert to fraction form
    398,645.28/550,134.81 = 217,355.76/x
  3. Step 3: Cross multiply
    398,645.28x = 550,134.81 × 217,355.76
  4. Step 4: Simplify right side
    398,645.28x = 119,574,969,730.01
  5. Step 5: Solve for x
    x = 119,574,969,730.01/398,645.28
  6. Step 6: Final answer
    x = 299,953.31

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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.