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Finding the Fourth Proportional to 21,638.50, 29,861.22 and 11,702.50

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Solution

The fourth proportional to 21,638.50, 29,861.22 and 11,702.50 is: 16,149.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,638.50 : 29,861.22 = 11,702.50 : x
  2. Step 2: Convert to fraction form
    21,638.50/29,861.22 = 11,702.50/x
  3. Step 3: Cross multiply
    21,638.50x = 29,861.22 × 11,702.50
  4. Step 4: Simplify right side
    21,638.50x = 349,450,927.05
  5. Step 5: Solve for x
    x = 349,450,927.05/21,638.50
  6. Step 6: Final answer
    x = 16,149.50

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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.