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Finding the Fourth Proportional to 21,193.68, 29,240.52 and 12,240

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Solution

The fourth proportional to 21,193.68, 29,240.52 and 12,240 is: 16,887.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,193.68 : 29,240.52 = 12,240 : x
  2. Step 2: Convert to fraction form
    21,193.68/29,240.52 = 12,240/x
  3. Step 3: Cross multiply
    21,193.68x = 29,240.52 × 12,240
  4. Step 4: Simplify right side
    21,193.68x = 357,903,964.80
  5. Step 5: Solve for x
    x = 357,903,964.80/21,193.68
  6. Step 6: Final answer
    x = 16,887.30

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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.