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Finding the Fourth Proportional to 66,103.45, 99,134.15 and 21,719.90

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Solution

The fourth proportional to 66,103.45, 99,134.15 and 21,719.90 is: 32,572.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,103.45 : 99,134.15 = 21,719.90 : x
  2. Step 2: Convert to fraction form
    66,103.45/99,134.15 = 21,719.90/x
  3. Step 3: Cross multiply
    66,103.45x = 99,134.15 × 21,719.90
  4. Step 4: Simplify right side
    66,103.45x = 2,153,183,963.82
  5. Step 5: Solve for x
    x = 2,153,183,963.82/66,103.45
  6. Step 6: Final answer
    x = 32,572.95

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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.