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Finding the Fourth Proportional to 21,885.88, 30,184.68 and 13,914.40

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Solution

The fourth proportional to 21,885.88, 30,184.68 and 13,914.40 is: 19,190.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,885.88 : 30,184.68 = 13,914.40 : x
  2. Step 2: Convert to fraction form
    21,885.88/30,184.68 = 13,914.40/x
  3. Step 3: Cross multiply
    21,885.88x = 30,184.68 × 13,914.40
  4. Step 4: Simplify right side
    21,885.88x = 420,001,711.39
  5. Step 5: Solve for x
    x = 420,001,711.39/21,885.88
  6. Step 6: Final answer
    x = 19,190.53

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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.