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Finding the Fourth Proportional to 68,689.50, 102,996.36 and 21,291.45

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Solution

The fourth proportional to 68,689.50, 102,996.36 and 21,291.45 is: 31,925.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,689.50 : 102,996.36 = 21,291.45 : x
  2. Step 2: Convert to fraction form
    68,689.50/102,996.36 = 21,291.45/x
  3. Step 3: Cross multiply
    68,689.50x = 102,996.36 × 21,291.45
  4. Step 4: Simplify right side
    68,689.50x = 2,192,941,849.12
  5. Step 5: Solve for x
    x = 2,192,941,849.12/68,689.50
  6. Step 6: Final answer
    x = 31,925.43

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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.