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Finding the Fourth Proportional to 252.09, 378.18 and 89.77

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Solution

The fourth proportional to 252.09, 378.18 and 89.77 is: 134.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    252.09 : 378.18 = 89.77 : x
  2. Step 2: Convert to fraction form
    252.09/378.18 = 89.77/x
  3. Step 3: Cross multiply
    252.09x = 378.18 × 89.77
  4. Step 4: Simplify right side
    252.09x = 33,948.27
  5. Step 5: Solve for x
    x = 33,948.27/252.09
  6. Step 6: Final answer
    x = 134.67

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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.