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Finding the Fourth Proportional to 18,857.78, 28,296.49 and 7,615.90

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Solution

The fourth proportional to 18,857.78, 28,296.49 and 7,615.90 is: 11,427.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,857.78 : 28,296.49 = 7,615.90 : x
  2. Step 2: Convert to fraction form
    18,857.78/28,296.49 = 7,615.90/x
  3. Step 3: Cross multiply
    18,857.78x = 28,296.49 × 7,615.90
  4. Step 4: Simplify right side
    18,857.78x = 215,503,077.67
  5. Step 5: Solve for x
    x = 215,503,077.67/18,857.78
  6. Step 6: Final answer
    x = 11,427.81

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.