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Finding the Fourth Proportional to 212,729.70, 319,072.95 and 72,486.30

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Solution

The fourth proportional to 212,729.70, 319,072.95 and 72,486.30 is: 108,722.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,729.70 : 319,072.95 = 72,486.30 : x
  2. Step 2: Convert to fraction form
    212,729.70/319,072.95 = 72,486.30/x
  3. Step 3: Cross multiply
    212,729.70x = 319,072.95 × 72,486.30
  4. Step 4: Simplify right side
    212,729.70x = 23,128,417,575.59
  5. Step 5: Solve for x
    x = 23,128,417,575.59/212,729.70
  6. Step 6: Final answer
    x = 108,722.09

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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.