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Finding the Fourth Proportional to 628,610.48, 867,645.72 and 399,278

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Solution

The fourth proportional to 628,610.48, 867,645.72 and 399,278 is: 551,107.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    628,610.48 : 867,645.72 = 399,278 : x
  2. Step 2: Convert to fraction form
    628,610.48/867,645.72 = 399,278/x
  3. Step 3: Cross multiply
    628,610.48x = 867,645.72 × 399,278
  4. Step 4: Simplify right side
    628,610.48x = 346,431,847,790.16
  5. Step 5: Solve for x
    x = 346,431,847,790.16/628,610.48
  6. Step 6: Final answer
    x = 551,107.34

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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.