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Finding the Fourth Proportional to 21,355.68, 29,463.03 and 13,395

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Solution

The fourth proportional to 21,355.68, 29,463.03 and 13,395 is: 18,480.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,355.68 : 29,463.03 = 13,395 : x
  2. Step 2: Convert to fraction form
    21,355.68/29,463.03 = 13,395/x
  3. Step 3: Cross multiply
    21,355.68x = 29,463.03 × 13,395
  4. Step 4: Simplify right side
    21,355.68x = 394,657,286.85
  5. Step 5: Solve for x
    x = 394,657,286.85/21,355.68
  6. Step 6: Final answer
    x = 18,480.20

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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.