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Finding the Fourth Proportional to 21,605.67, 29,815.74 and 12,174.39

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Solution

The fourth proportional to 21,605.67, 29,815.74 and 12,174.39 is: 16,800.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,605.67 : 29,815.74 = 12,174.39 : x
  2. Step 2: Convert to fraction form
    21,605.67/29,815.74 = 12,174.39/x
  3. Step 3: Cross multiply
    21,605.67x = 29,815.74 × 12,174.39
  4. Step 4: Simplify right side
    21,605.67x = 362,988,446.90
  5. Step 5: Solve for x
    x = 362,988,446.90/21,605.67
  6. Step 6: Final answer
    x = 16,800.61

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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.