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Finding the Fourth Proportional to 21,381.52, 32,054.98 and 8,910.94

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Solution

The fourth proportional to 21,381.52, 32,054.98 and 8,910.94 is: 13,359.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,381.52 : 32,054.98 = 8,910.94 : x
  2. Step 2: Convert to fraction form
    21,381.52/32,054.98 = 8,910.94/x
  3. Step 3: Cross multiply
    21,381.52x = 32,054.98 × 8,910.94
  4. Step 4: Simplify right side
    21,381.52x = 285,640,003.48
  5. Step 5: Solve for x
    x = 285,640,003.48/21,381.52
  6. Step 6: Final answer
    x = 13,359.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.