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Finding the Fourth Proportional to 68,520.72, 102,790.80 and 21,139.76

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Solution

The fourth proportional to 68,520.72, 102,790.80 and 21,139.76 is: 31,712.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,520.72 : 102,790.80 = 21,139.76 : x
  2. Step 2: Convert to fraction form
    68,520.72/102,790.80 = 21,139.76/x
  3. Step 3: Cross multiply
    68,520.72x = 102,790.80 × 21,139.76
  4. Step 4: Simplify right side
    68,520.72x = 2,172,972,842.21
  5. Step 5: Solve for x
    x = 2,172,972,842.21/68,520.72
  6. Step 6: Final answer
    x = 31,712.64

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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.