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Finding the Fourth Proportional to 398,784.20, 550,011 and 255,557.56

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Solution

The fourth proportional to 398,784.20, 550,011 and 255,557.56 is: 352,470.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,784.20 : 550,011 = 255,557.56 : x
  2. Step 2: Convert to fraction form
    398,784.20/550,011 = 255,557.56/x
  3. Step 3: Cross multiply
    398,784.20x = 550,011 × 255,557.56
  4. Step 4: Simplify right side
    398,784.20x = 140,559,469,133.16
  5. Step 5: Solve for x
    x = 140,559,469,133.16/398,784.20
  6. Step 6: Final answer
    x = 352,470.01

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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.