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Finding the Fourth Proportional to 68,701.49, 103,066.94 and 21,315.56

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Solution

The fourth proportional to 68,701.49, 103,066.94 and 21,315.56 is: 31,977.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,701.49 : 103,066.94 = 21,315.56 : x
  2. Step 2: Convert to fraction form
    68,701.49/103,066.94 = 21,315.56/x
  3. Step 3: Cross multiply
    68,701.49x = 103,066.94 × 21,315.56
  4. Step 4: Simplify right side
    68,701.49x = 2,196,928,921.67
  5. Step 5: Solve for x
    x = 2,196,928,921.67/68,701.49
  6. Step 6: Final answer
    x = 31,977.90

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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.