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Finding the Fourth Proportional to 486.32, 670.91 and 289.83

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Solution

The fourth proportional to 486.32, 670.91 and 289.83 is: 399.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.32 : 670.91 = 289.83 : x
  2. Step 2: Convert to fraction form
    486.32/670.91 = 289.83/x
  3. Step 3: Cross multiply
    486.32x = 670.91 × 289.83
  4. Step 4: Simplify right side
    486.32x = 194,450.57
  5. Step 5: Solve for x
    x = 194,450.57/486.32
  6. Step 6: Final answer
    x = 399.84

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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.