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Finding the Fourth Proportional to 18,486.71, 27,729.64 and 5,159.35

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Solution

The fourth proportional to 18,486.71, 27,729.64 and 5,159.35 is: 7,738.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,486.71 : 27,729.64 = 5,159.35 : x
  2. Step 2: Convert to fraction form
    18,486.71/27,729.64 = 5,159.35/x
  3. Step 3: Cross multiply
    18,486.71x = 27,729.64 × 5,159.35
  4. Step 4: Simplify right side
    18,486.71x = 143,066,918.13
  5. Step 5: Solve for x
    x = 143,066,918.13/18,486.71
  6. Step 6: Final answer
    x = 7,738.91

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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.