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Finding the Fourth Proportional to 21,449.61, 29,599.65 and 11,889.90

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Solution

The fourth proportional to 21,449.61, 29,599.65 and 11,889.90 is: 16,407.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,449.61 : 29,599.65 = 11,889.90 : x
  2. Step 2: Convert to fraction form
    21,449.61/29,599.65 = 11,889.90/x
  3. Step 3: Cross multiply
    21,449.61x = 29,599.65 × 11,889.90
  4. Step 4: Simplify right side
    21,449.61x = 351,936,878.54
  5. Step 5: Solve for x
    x = 351,936,878.54/21,449.61
  6. Step 6: Final answer
    x = 16,407.61

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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.