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Finding the Fourth Proportional to 21,771.88, 30,045.54 and 12,213.90

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Solution

The fourth proportional to 21,771.88, 30,045.54 and 12,213.90 is: 16,855.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,771.88 : 30,045.54 = 12,213.90 : x
  2. Step 2: Convert to fraction form
    21,771.88/30,045.54 = 12,213.90/x
  3. Step 3: Cross multiply
    21,771.88x = 30,045.54 × 12,213.90
  4. Step 4: Simplify right side
    21,771.88x = 366,973,009.71
  5. Step 5: Solve for x
    x = 366,973,009.71/21,771.88
  6. Step 6: Final answer
    x = 16,855.37

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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.