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Finding the Fourth Proportional to 186.10, 278.79 and 105.00

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Solution

The fourth proportional to 186.10, 278.79 and 105.00 is: 157.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.10 : 278.79 = 105.00 : x
  2. Step 2: Convert to fraction form
    186.10/278.79 = 105.00/x
  3. Step 3: Cross multiply
    186.10x = 278.79 × 105.00
  4. Step 4: Simplify right side
    186.10x = 29,272.10
  5. Step 5: Solve for x
    x = 29,272.10/186.10
  6. Step 6: Final answer
    x = 157.29

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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.