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Finding the Fourth Proportional to 21,189.68, 29,235 and 12,236

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Solution

The fourth proportional to 21,189.68, 29,235 and 12,236 is: 16,881.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,189.68 : 29,235 = 12,236 : x
  2. Step 2: Convert to fraction form
    21,189.68/29,235 = 12,236/x
  3. Step 3: Cross multiply
    21,189.68x = 29,235 × 12,236
  4. Step 4: Simplify right side
    21,189.68x = 357,719,460
  5. Step 5: Solve for x
    x = 357,719,460/21,189.68
  6. Step 6: Final answer
    x = 16,881.78

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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.