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Finding the Fourth Proportional to 21,299.49, 29,393.49 and 11,739.72

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Solution

The fourth proportional to 21,299.49, 29,393.49 and 11,739.72 is: 16,200.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,299.49 : 29,393.49 = 11,739.72 : x
  2. Step 2: Convert to fraction form
    21,299.49/29,393.49 = 11,739.72/x
  3. Step 3: Cross multiply
    21,299.49x = 29,393.49 × 11,739.72
  4. Step 4: Simplify right side
    21,299.49x = 345,071,136.76
  5. Step 5: Solve for x
    x = 345,071,136.76/21,299.49
  6. Step 6: Final answer
    x = 16,200.91

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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.