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Finding the Fourth Proportional to 68,653, 102,990.62 and 21,256.95

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Solution

The fourth proportional to 68,653, 102,990.62 and 21,256.95 is: 31,888.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,653 : 102,990.62 = 21,256.95 : x
  2. Step 2: Convert to fraction form
    68,653/102,990.62 = 21,256.95/x
  3. Step 3: Cross multiply
    68,653x = 102,990.62 × 21,256.95
  4. Step 4: Simplify right side
    68,653x = 2,189,266,459.81
  5. Step 5: Solve for x
    x = 2,189,266,459.81/68,653
  6. Step 6: Final answer
    x = 31,888.87

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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.