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Finding the Fourth Proportional to 398,785.69, 550,013.07 and 255,559.06

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Solution

The fourth proportional to 398,785.69, 550,013.07 and 255,559.06 is: 352,472.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,785.69 : 550,013.07 = 255,559.06 : x
  2. Step 2: Convert to fraction form
    398,785.69/550,013.07 = 255,559.06/x
  3. Step 3: Cross multiply
    398,785.69x = 550,013.07 × 255,559.06
  4. Step 4: Simplify right side
    398,785.69x = 140,560,823,156.91
  5. Step 5: Solve for x
    x = 140,560,823,156.91/398,785.69
  6. Step 6: Final answer
    x = 352,472.08

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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.