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Finding the Fourth Proportional to 68,437.75, 102,656.88 and 21,052.53

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Solution

The fourth proportional to 68,437.75, 102,656.88 and 21,052.53 is: 31,578.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,437.75 : 102,656.88 = 21,052.53 : x
  2. Step 2: Convert to fraction form
    68,437.75/102,656.88 = 21,052.53/x
  3. Step 3: Cross multiply
    68,437.75x = 102,656.88 × 21,052.53
  4. Step 4: Simplify right side
    68,437.75x = 2,161,187,045.91
  5. Step 5: Solve for x
    x = 2,161,187,045.91/68,437.75
  6. Step 6: Final answer
    x = 31,578.87

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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.