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Finding the Fourth Proportional to 21,239.66, 29,310.66 and 11,808.22

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Solution

The fourth proportional to 21,239.66, 29,310.66 and 11,808.22 is: 16,295.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,239.66 : 29,310.66 = 11,808.22 : x
  2. Step 2: Convert to fraction form
    21,239.66/29,310.66 = 11,808.22/x
  3. Step 3: Cross multiply
    21,239.66x = 29,310.66 × 11,808.22
  4. Step 4: Simplify right side
    21,239.66x = 346,106,721.63
  5. Step 5: Solve for x
    x = 346,106,721.63/21,239.66
  6. Step 6: Final answer
    x = 16,295.30

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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.