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Finding the Fourth Proportional to 661,004.20, 991,311.90 and 261,512.20

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Solution

The fourth proportional to 661,004.20, 991,311.90 and 261,512.20 is: 392,191.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,004.20 : 991,311.90 = 261,512.20 : x
  2. Step 2: Convert to fraction form
    661,004.20/991,311.90 = 261,512.20/x
  3. Step 3: Cross multiply
    661,004.20x = 991,311.90 × 261,512.20
  4. Step 4: Simplify right side
    661,004.20x = 259,240,155,855.18
  5. Step 5: Solve for x
    x = 259,240,155,855.18/661,004.20
  6. Step 6: Final answer
    x = 392,191.39

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.