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Finding the Fourth Proportional to 640,728.50, 884,380.75 and 398,867.36

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Solution

The fourth proportional to 640,728.50, 884,380.75 and 398,867.36 is: 550,546.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,728.50 : 884,380.75 = 398,867.36 : x
  2. Step 2: Convert to fraction form
    640,728.50/884,380.75 = 398,867.36/x
  3. Step 3: Cross multiply
    640,728.50x = 884,380.75 × 398,867.36
  4. Step 4: Simplify right side
    640,728.50x = 352,750,609,568.25
  5. Step 5: Solve for x
    x = 352,750,609,568.25/640,728.50
  6. Step 6: Final answer
    x = 550,546.16

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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.