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Finding the Fourth Proportional to 21,670.88, 29,906.15 and 12,239.51

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Solution

The fourth proportional to 21,670.88, 29,906.15 and 12,239.51 is: 16,890.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,670.88 : 29,906.15 = 12,239.51 : x
  2. Step 2: Convert to fraction form
    21,670.88/29,906.15 = 12,239.51/x
  3. Step 3: Cross multiply
    21,670.88x = 29,906.15 × 12,239.51
  4. Step 4: Simplify right side
    21,670.88x = 366,036,411.26
  5. Step 5: Solve for x
    x = 366,036,411.26/21,670.88
  6. Step 6: Final answer
    x = 16,890.71

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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.