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Finding the Fourth Proportional to 398,978.92, 550,092.90 and 255,503.08

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Solution

The fourth proportional to 398,978.92, 550,092.90 and 255,503.08 is: 352,275.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,978.92 : 550,092.90 = 255,503.08 : x
  2. Step 2: Convert to fraction form
    398,978.92/550,092.90 = 255,503.08/x
  3. Step 3: Cross multiply
    398,978.92x = 550,092.90 × 255,503.08
  4. Step 4: Simplify right side
    398,978.92x = 140,550,430,236.13
  5. Step 5: Solve for x
    x = 140,550,430,236.13/398,978.92
  6. Step 6: Final answer
    x = 352,275.33

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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.