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Finding the Fourth Proportional to 486.05, 670.01 and 320.40

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Solution

The fourth proportional to 486.05, 670.01 and 320.40 is: 441.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.05 : 670.01 = 320.40 : x
  2. Step 2: Convert to fraction form
    486.05/670.01 = 320.40/x
  3. Step 3: Cross multiply
    486.05x = 670.01 × 320.40
  4. Step 4: Simplify right side
    486.05x = 214,669.60
  5. Step 5: Solve for x
    x = 214,669.60/486.05
  6. Step 6: Final answer
    x = 441.67

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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.