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Finding the Fourth Proportional to 212,934.20, 319,379.70 and 72,690.80

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Solution

The fourth proportional to 212,934.20, 319,379.70 and 72,690.80 is: 109,028.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,934.20 : 319,379.70 = 72,690.80 : x
  2. Step 2: Convert to fraction form
    212,934.20/319,379.70 = 72,690.80/x
  3. Step 3: Cross multiply
    212,934.20x = 319,379.70 × 72,690.80
  4. Step 4: Simplify right side
    212,934.20x = 23,215,965,896.76
  5. Step 5: Solve for x
    x = 23,215,965,896.76/212,934.20
  6. Step 6: Final answer
    x = 109,028.83

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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.