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Finding the Fourth Proportional to 439.08, 606.55 and 399.67

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Solution

The fourth proportional to 439.08, 606.55 and 399.67 is: 552.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.08 : 606.55 = 399.67 : x
  2. Step 2: Convert to fraction form
    439.08/606.55 = 399.67/x
  3. Step 3: Cross multiply
    439.08x = 606.55 × 399.67
  4. Step 4: Simplify right side
    439.08x = 242,419.84
  5. Step 5: Solve for x
    x = 242,419.84/439.08
  6. Step 6: Final answer
    x = 552.11

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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.