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Finding the Fourth Proportional to 398,907.90, 550,452.51 and 245,921.58

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Solution

The fourth proportional to 398,907.90, 550,452.51 and 245,921.58 is: 339,346.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,907.90 : 550,452.51 = 245,921.58 : x
  2. Step 2: Convert to fraction form
    398,907.90/550,452.51 = 245,921.58/x
  3. Step 3: Cross multiply
    398,907.90x = 550,452.51 × 245,921.58
  4. Step 4: Simplify right side
    398,907.90x = 135,368,150,974.17
  5. Step 5: Solve for x
    x = 135,368,150,974.17/398,907.90
  6. Step 6: Final answer
    x = 339,346.88

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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.