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Finding the Fourth Proportional to 68,453.95, 102,690.65 and 21,072.98

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Solution

The fourth proportional to 68,453.95, 102,690.65 and 21,072.98 is: 31,612.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,453.95 : 102,690.65 = 21,072.98 : x
  2. Step 2: Convert to fraction form
    68,453.95/102,690.65 = 21,072.98/x
  3. Step 3: Cross multiply
    68,453.95x = 102,690.65 × 21,072.98
  4. Step 4: Simplify right side
    68,453.95x = 2,163,998,013.64
  5. Step 5: Solve for x
    x = 2,163,998,013.64/68,453.95
  6. Step 6: Final answer
    x = 31,612.46

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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.