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Finding the Fourth Proportional to 212,928, 319,446 and 79,808.64

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Solution

The fourth proportional to 212,928, 319,446 and 79,808.64 is: 119,733.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,928 : 319,446 = 79,808.64 : x
  2. Step 2: Convert to fraction form
    212,928/319,446 = 79,808.64/x
  3. Step 3: Cross multiply
    212,928x = 319,446 × 79,808.64
  4. Step 4: Simplify right side
    212,928x = 25,494,550,813.44
  5. Step 5: Solve for x
    x = 25,494,550,813.44/212,928
  6. Step 6: Final answer
    x = 119,733.20

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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.