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Finding the Fourth Proportional to 398,765.39, 550,480.52 and 245,830.91

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Solution

The fourth proportional to 398,765.39, 550,480.52 and 245,830.91 is: 339,360.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,765.39 : 550,480.52 = 245,830.91 : x
  2. Step 2: Convert to fraction form
    398,765.39/550,480.52 = 245,830.91/x
  3. Step 3: Cross multiply
    398,765.39x = 550,480.52 × 245,830.91
  4. Step 4: Simplify right side
    398,765.39x = 135,325,125,031.05
  5. Step 5: Solve for x
    x = 135,325,125,031.05/398,765.39
  6. Step 6: Final answer
    x = 339,360.26

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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.