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Finding the Fourth Proportional to 68,036.20, 102,039.72 and 21,283

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Solution

The fourth proportional to 68,036.20, 102,039.72 and 21,283 is: 31,919.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,036.20 : 102,039.72 = 21,283 : x
  2. Step 2: Convert to fraction form
    68,036.20/102,039.72 = 21,283/x
  3. Step 3: Cross multiply
    68,036.20x = 102,039.72 × 21,283
  4. Step 4: Simplify right side
    68,036.20x = 2,171,711,360.76
  5. Step 5: Solve for x
    x = 2,171,711,360.76/68,036.20
  6. Step 6: Final answer
    x = 31,919.94

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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.