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Finding the Fourth Proportional to 18,605.78, 27,911.74 and 8,620.50

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Solution

The fourth proportional to 18,605.78, 27,911.74 and 8,620.50 is: 12,932.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,605.78 : 27,911.74 = 8,620.50 : x
  2. Step 2: Convert to fraction form
    18,605.78/27,911.74 = 8,620.50/x
  3. Step 3: Cross multiply
    18,605.78x = 27,911.74 × 8,620.50
  4. Step 4: Simplify right side
    18,605.78x = 240,613,133.12
  5. Step 5: Solve for x
    x = 240,613,133.12/18,605.78
  6. Step 6: Final answer
    x = 12,932.17

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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.