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Finding the Fourth Proportional to 21,617.81, 29,828.03 and 13,124.37

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Solution

The fourth proportional to 21,617.81, 29,828.03 and 13,124.37 is: 18,108.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,617.81 : 29,828.03 = 13,124.37 : x
  2. Step 2: Convert to fraction form
    21,617.81/29,828.03 = 13,124.37/x
  3. Step 3: Cross multiply
    21,617.81x = 29,828.03 × 13,124.37
  4. Step 4: Simplify right side
    21,617.81x = 391,474,036.47
  5. Step 5: Solve for x
    x = 391,474,036.47/21,617.81
  6. Step 6: Final answer
    x = 18,108.87

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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.