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Finding the Fourth Proportional to 398,986.42, 550,103.25 and 255,510.58

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Solution

The fourth proportional to 398,986.42, 550,103.25 and 255,510.58 is: 352,285.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,986.42 : 550,103.25 = 255,510.58 : x
  2. Step 2: Convert to fraction form
    398,986.42/550,103.25 = 255,510.58/x
  3. Step 3: Cross multiply
    398,986.42x = 550,103.25 × 255,510.58
  4. Step 4: Simplify right side
    398,986.42x = 140,557,200,467.39
  5. Step 5: Solve for x
    x = 140,557,200,467.39/398,986.42
  6. Step 6: Final answer
    x = 352,285.68

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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.