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Finding the Fourth Proportional to 68,069.58, 102,114.90 and 21,318

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Solution

The fourth proportional to 68,069.58, 102,114.90 and 21,318 is: 31,980.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,069.58 : 102,114.90 = 21,318 : x
  2. Step 2: Convert to fraction form
    68,069.58/102,114.90 = 21,318/x
  3. Step 3: Cross multiply
    68,069.58x = 102,114.90 × 21,318
  4. Step 4: Simplify right side
    68,069.58x = 2,176,885,438.20
  5. Step 5: Solve for x
    x = 2,176,885,438.20/68,069.58
  6. Step 6: Final answer
    x = 31,980.30

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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.