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Finding the Fourth Proportional to 21,285, 29,373.30 and 11,855.39

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Solution

The fourth proportional to 21,285, 29,373.30 and 11,855.39 is: 16,360.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,285 : 29,373.30 = 11,855.39 : x
  2. Step 2: Convert to fraction form
    21,285/29,373.30 = 11,855.39/x
  3. Step 3: Cross multiply
    21,285x = 29,373.30 × 11,855.39
  4. Step 4: Simplify right side
    21,285x = 348,231,780.22
  5. Step 5: Solve for x
    x = 348,231,780.22/21,285
  6. Step 6: Final answer
    x = 16,360.43

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1.5x scale

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.