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Finding the Fourth Proportional to 186.99, 258.08 and 155.86

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Solution

The fourth proportional to 186.99, 258.08 and 155.86 is: 215.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.99 : 258.08 = 155.86 : x
  2. Step 2: Convert to fraction form
    186.99/258.08 = 155.86/x
  3. Step 3: Cross multiply
    186.99x = 258.08 × 155.86
  4. Step 4: Simplify right side
    186.99x = 40,223.06
  5. Step 5: Solve for x
    x = 40,223.06/186.99
  6. Step 6: Final answer
    x = 215.11

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.