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Finding the Fourth Proportional to 21,791.40, 30,071.30 and 11,855.40

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Solution

The fourth proportional to 21,791.40, 30,071.30 and 11,855.40 is: 16,360.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,791.40 : 30,071.30 = 11,855.40 : x
  2. Step 2: Convert to fraction form
    21,791.40/30,071.30 = 11,855.40/x
  3. Step 3: Cross multiply
    21,791.40x = 30,071.30 × 11,855.40
  4. Step 4: Simplify right side
    21,791.40x = 356,507,290.02
  5. Step 5: Solve for x
    x = 356,507,290.02/21,791.40
  6. Step 6: Final answer
    x = 16,360.00

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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.