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Finding the Fourth Proportional to 21,309.00, 29,391.22 and 18,471.30

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Solution

The fourth proportional to 21,309.00, 29,391.22 and 18,471.30 is: 25,477.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,309.00 : 29,391.22 = 18,471.30 : x
  2. Step 2: Convert to fraction form
    21,309.00/29,391.22 = 18,471.30/x
  3. Step 3: Cross multiply
    21,309.00x = 29,391.22 × 18,471.30
  4. Step 4: Simplify right side
    21,309.00x = 542,893,802.67
  5. Step 5: Solve for x
    x = 542,893,802.67/21,309.00
  6. Step 6: Final answer
    x = 25,477.21

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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.