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Finding the Fourth Proportional to 252,187.20, 378,255.20 and 85,972.80

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Solution

The fourth proportional to 252,187.20, 378,255.20 and 85,972.80 is: 128,950.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    252,187.20 : 378,255.20 = 85,972.80 : x
  2. Step 2: Convert to fraction form
    252,187.20/378,255.20 = 85,972.80/x
  3. Step 3: Cross multiply
    252,187.20x = 378,255.20 × 85,972.80
  4. Step 4: Simplify right side
    252,187.20x = 32,519,658,658.56
  5. Step 5: Solve for x
    x = 32,519,658,658.56/252,187.20
  6. Step 6: Final answer
    x = 128,950.47

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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.