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Finding the Fourth Proportional to 186.72, 279.72 and 90.24

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Solution

The fourth proportional to 186.72, 279.72 and 90.24 is: 135.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.72 : 279.72 = 90.24 : x
  2. Step 2: Convert to fraction form
    186.72/279.72 = 90.24/x
  3. Step 3: Cross multiply
    186.72x = 279.72 × 90.24
  4. Step 4: Simplify right side
    186.72x = 25,241.93
  5. Step 5: Solve for x
    x = 25,241.93/186.72
  6. Step 6: Final answer
    x = 135.19

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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.