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Finding the Fourth Proportional to 21,640.83, 29,864.88 and 12,210

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Solution

The fourth proportional to 21,640.83, 29,864.88 and 12,210 is: 16,850.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,640.83 : 29,864.88 = 12,210 : x
  2. Step 2: Convert to fraction form
    21,640.83/29,864.88 = 12,210/x
  3. Step 3: Cross multiply
    21,640.83x = 29,864.88 × 12,210
  4. Step 4: Simplify right side
    21,640.83x = 364,650,184.80
  5. Step 5: Solve for x
    x = 364,650,184.80/21,640.83
  6. Step 6: Final answer
    x = 16,850.10

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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.