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Finding the Fourth Proportional to 21,757.84, 30,023.96 and 12,681.80

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Solution

The fourth proportional to 21,757.84, 30,023.96 and 12,681.80 is: 17,499.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,757.84 : 30,023.96 = 12,681.80 : x
  2. Step 2: Convert to fraction form
    21,757.84/30,023.96 = 12,681.80/x
  3. Step 3: Cross multiply
    21,757.84x = 30,023.96 × 12,681.80
  4. Step 4: Simplify right side
    21,757.84x = 380,757,855.93
  5. Step 5: Solve for x
    x = 380,757,855.93/21,757.84
  6. Step 6: Final answer
    x = 17,499.80

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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.