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Finding the Fourth Proportional to 290.86, 436.65 and 187.81

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Solution

The fourth proportional to 290.86, 436.65 and 187.81 is: 281.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.86 : 436.65 = 187.81 : x
  2. Step 2: Convert to fraction form
    290.86/436.65 = 187.81/x
  3. Step 3: Cross multiply
    290.86x = 436.65 × 187.81
  4. Step 4: Simplify right side
    290.86x = 82,007.24
  5. Step 5: Solve for x
    x = 82,007.24/290.86
  6. Step 6: Final answer
    x = 281.95

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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.