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Finding the Fourth Proportional to 27,138.78, 40,642.16 and 18,795.38

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Solution

The fourth proportional to 27,138.78, 40,642.16 and 18,795.38 is: 28,147.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    27,138.78 : 40,642.16 = 18,795.38 : x
  2. Step 2: Convert to fraction form
    27,138.78/40,642.16 = 18,795.38/x
  3. Step 3: Cross multiply
    27,138.78x = 40,642.16 × 18,795.38
  4. Step 4: Simplify right side
    27,138.78x = 763,884,544.03
  5. Step 5: Solve for x
    x = 763,884,544.03/27,138.78
  6. Step 6: Final answer
    x = 28,147.34

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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.