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Finding the Fourth Proportional to 21,905.35, 30,229.35 and 12,473.91

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Solution

The fourth proportional to 21,905.35, 30,229.35 and 12,473.91 is: 17,213.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,905.35 : 30,229.35 = 12,473.91 : x
  2. Step 2: Convert to fraction form
    21,905.35/30,229.35 = 12,473.91/x
  3. Step 3: Cross multiply
    21,905.35x = 30,229.35 × 12,473.91
  4. Step 4: Simplify right side
    21,905.35x = 377,078,191.26
  5. Step 5: Solve for x
    x = 377,078,191.26/21,905.35
  6. Step 6: Final answer
    x = 17,213.98

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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.