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Finding the Fourth Proportional to 398,781.78, 550,303.65 and 219,933.78

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Solution

The fourth proportional to 398,781.78, 550,303.65 and 219,933.78 is: 303,500.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,781.78 : 550,303.65 = 219,933.78 : x
  2. Step 2: Convert to fraction form
    398,781.78/550,303.65 = 219,933.78/x
  3. Step 3: Cross multiply
    398,781.78x = 550,303.65 × 219,933.78
  4. Step 4: Simplify right side
    398,781.78x = 121,030,361,892.30
  5. Step 5: Solve for x
    x = 121,030,361,892.30/398,781.78
  6. Step 6: Final answer
    x = 303,500.23

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1.5x scale

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.