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Finding the Fourth Proportional to 660.96, 912.24 and 439.56

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Solution

The fourth proportional to 660.96, 912.24 and 439.56 is: 606.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.96 : 912.24 = 439.56 : x
  2. Step 2: Convert to fraction form
    660.96/912.24 = 439.56/x
  3. Step 3: Cross multiply
    660.96x = 912.24 × 439.56
  4. Step 4: Simplify right side
    660.96x = 400,984.21
  5. Step 5: Solve for x
    x = 400,984.21/660.96
  6. Step 6: Final answer
    x = 606.67

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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.