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Finding the Fourth Proportional to 21,881.88, 30,179.16 and 13,910.40

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Solution

The fourth proportional to 21,881.88, 30,179.16 and 13,910.40 is: 19,185.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,881.88 : 30,179.16 = 13,910.40 : x
  2. Step 2: Convert to fraction form
    21,881.88/30,179.16 = 13,910.40/x
  3. Step 3: Cross multiply
    21,881.88x = 30,179.16 × 13,910.40
  4. Step 4: Simplify right side
    21,881.88x = 419,804,187.26
  5. Step 5: Solve for x
    x = 419,804,187.26/21,881.88
  6. Step 6: Final answer
    x = 19,185.01

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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.