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Finding the Fourth Proportional to 21,167.71, 29,203.46 and 12,211.94

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Solution

The fourth proportional to 21,167.71, 29,203.46 and 12,211.94 is: 16,847.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,167.71 : 29,203.46 = 12,211.94 : x
  2. Step 2: Convert to fraction form
    21,167.71/29,203.46 = 12,211.94/x
  3. Step 3: Cross multiply
    21,167.71x = 29,203.46 × 12,211.94
  4. Step 4: Simplify right side
    21,167.71x = 356,630,901.31
  5. Step 5: Solve for x
    x = 356,630,901.31/21,167.71
  6. Step 6: Final answer
    x = 16,847.87

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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.