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Finding the Fourth Proportional to 671,021.25, 925,704.20 and 398,934.75

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Solution

The fourth proportional to 671,021.25, 925,704.20 and 398,934.75 is: 550,348.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    671,021.25 : 925,704.20 = 398,934.75 : x
  2. Step 2: Convert to fraction form
    671,021.25/925,704.20 = 398,934.75/x
  3. Step 3: Cross multiply
    671,021.25x = 925,704.20 × 398,934.75
  4. Step 4: Simplify right side
    671,021.25x = 369,295,575,825.67
  5. Step 5: Solve for x
    x = 369,295,575,825.67/671,021.25
  6. Step 6: Final answer
    x = 550,348.56

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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.