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Finding the Fourth Proportional to 68,704.01, 103,070.69 and 21,318.06

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Solution

The fourth proportional to 68,704.01, 103,070.69 and 21,318.06 is: 31,981.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,704.01 : 103,070.69 = 21,318.06 : x
  2. Step 2: Convert to fraction form
    68,704.01/103,070.69 = 21,318.06/x
  3. Step 3: Cross multiply
    68,704.01x = 103,070.69 × 21,318.06
  4. Step 4: Simplify right side
    68,704.01x = 2,197,267,153.66
  5. Step 5: Solve for x
    x = 2,197,267,153.66/68,704.01
  6. Step 6: Final answer
    x = 31,981.64

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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.