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Finding the Fourth Proportional to 21,618.31, 29,832.87 and 12,186.88

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Solution

The fourth proportional to 21,618.31, 29,832.87 and 12,186.88 is: 16,817.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,618.31 : 29,832.87 = 12,186.88 : x
  2. Step 2: Convert to fraction form
    21,618.31/29,832.87 = 12,186.88/x
  3. Step 3: Cross multiply
    21,618.31x = 29,832.87 × 12,186.88
  4. Step 4: Simplify right side
    21,618.31x = 363,569,606.75
  5. Step 5: Solve for x
    x = 363,569,606.75/21,618.31
  6. Step 6: Final answer
    x = 16,817.67

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.