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Finding the Fourth Proportional to 398,845.43, 550,386.47 and 217,555.89

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Solution

The fourth proportional to 398,845.43, 550,386.47 and 217,555.89 is: 300,216.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,845.43 : 550,386.47 = 217,555.89 : x
  2. Step 2: Convert to fraction form
    398,845.43/550,386.47 = 217,555.89/x
  3. Step 3: Cross multiply
    398,845.43x = 550,386.47 × 217,555.89
  4. Step 4: Simplify right side
    398,845.43x = 119,739,819,288.80
  5. Step 5: Solve for x
    x = 119,739,819,288.80/398,845.43
  6. Step 6: Final answer
    x = 300,216.10

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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.