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Finding the Fourth Proportional to 186.24, 279.54 and 128.55

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Solution

The fourth proportional to 186.24, 279.54 and 128.55 is: 192.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.24 : 279.54 = 128.55 : x
  2. Step 2: Convert to fraction form
    186.24/279.54 = 128.55/x
  3. Step 3: Cross multiply
    186.24x = 279.54 × 128.55
  4. Step 4: Simplify right side
    186.24x = 35,934.87
  5. Step 5: Solve for x
    x = 35,934.87/186.24
  6. Step 6: Final answer
    x = 192.95

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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.