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Finding the Fourth Proportional to 251,190.40, 377,660.40 and 212,699.20

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Solution

The fourth proportional to 251,190.40, 377,660.40 and 212,699.20 is: 319,789.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    251,190.40 : 377,660.40 = 212,699.20 : x
  2. Step 2: Convert to fraction form
    251,190.40/377,660.40 = 212,699.20/x
  3. Step 3: Cross multiply
    251,190.40x = 377,660.40 × 212,699.20
  4. Step 4: Simplify right side
    251,190.40x = 80,328,064,951.68
  5. Step 5: Solve for x
    x = 80,328,064,951.68/251,190.40
  6. Step 6: Final answer
    x = 319,789.55

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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.