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Finding the Fourth Proportional to 68,703.41, 103,069.79 and 21,317.46

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Solution

The fourth proportional to 68,703.41, 103,069.79 and 21,317.46 is: 31,980.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,703.41 : 103,069.79 = 21,317.46 : x
  2. Step 2: Convert to fraction form
    68,703.41/103,069.79 = 21,317.46/x
  3. Step 3: Cross multiply
    68,703.41x = 103,069.79 × 21,317.46
  4. Step 4: Simplify right side
    68,703.41x = 2,197,186,018.95
  5. Step 5: Solve for x
    x = 2,197,186,018.95/68,703.41
  6. Step 6: Final answer
    x = 31,980.74

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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.