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Finding the Fourth Proportional to 68,405.11, 102,623.47 and 21,657.98

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Solution

The fourth proportional to 68,405.11, 102,623.47 and 21,657.98 is: 32,491.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,405.11 : 102,623.47 = 21,657.98 : x
  2. Step 2: Convert to fraction form
    68,405.11/102,623.47 = 21,657.98/x
  3. Step 3: Cross multiply
    68,405.11x = 102,623.47 × 21,657.98
  4. Step 4: Simplify right side
    68,405.11x = 2,222,617,263.20
  5. Step 5: Solve for x
    x = 2,222,617,263.20/68,405.11
  6. Step 6: Final answer
    x = 32,491.98

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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.