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Finding the Fourth Proportional to 186.99, 279.95 and 128.85

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Solution

The fourth proportional to 186.99, 279.95 and 128.85 is: 192.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.99 : 279.95 = 128.85 : x
  2. Step 2: Convert to fraction form
    186.99/279.95 = 128.85/x
  3. Step 3: Cross multiply
    186.99x = 279.95 × 128.85
  4. Step 4: Simplify right side
    186.99x = 36,070.91
  5. Step 5: Solve for x
    x = 36,070.91/186.99
  6. Step 6: Final answer
    x = 192.90

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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.