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Finding the Fourth Proportional to 186.42, 279.48 and 78.18

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Solution

The fourth proportional to 186.42, 279.48 and 78.18 is: 117.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.42 : 279.48 = 78.18 : x
  2. Step 2: Convert to fraction form
    186.42/279.48 = 78.18/x
  3. Step 3: Cross multiply
    186.42x = 279.48 × 78.18
  4. Step 4: Simplify right side
    186.42x = 21,849.75
  5. Step 5: Solve for x
    x = 21,849.75/186.42
  6. Step 6: Final answer
    x = 117.21

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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.