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Finding the Fourth Proportional to 291.61, 436.56 and 255.61

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Solution

The fourth proportional to 291.61, 436.56 and 255.61 is: 382.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.61 : 436.56 = 255.61 : x
  2. Step 2: Convert to fraction form
    291.61/436.56 = 255.61/x
  3. Step 3: Cross multiply
    291.61x = 436.56 × 255.61
  4. Step 4: Simplify right side
    291.61x = 111,589.10
  5. Step 5: Solve for x
    x = 111,589.10/291.61
  6. Step 6: Final answer
    x = 382.67

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.