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Finding the Fourth Proportional to 391,794.30, 540,791.64 and 255,849.50

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Solution

The fourth proportional to 391,794.30, 540,791.64 and 255,849.50 is: 353,147.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,794.30 : 540,791.64 = 255,849.50 : x
  2. Step 2: Convert to fraction form
    391,794.30/540,791.64 = 255,849.50/x
  3. Step 3: Cross multiply
    391,794.30x = 540,791.64 × 255,849.50
  4. Step 4: Simplify right side
    391,794.30x = 138,361,272,050.16
  5. Step 5: Solve for x
    x = 138,361,272,050.16/391,794.30
  6. Step 6: Final answer
    x = 353,147.74

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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.