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Finding the Fourth Proportional to 485.46, 669.92 and 289.08

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Solution

The fourth proportional to 485.46, 669.92 and 289.08 is: 398.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.46 : 669.92 = 289.08 : x
  2. Step 2: Convert to fraction form
    485.46/669.92 = 289.08/x
  3. Step 3: Cross multiply
    485.46x = 669.92 × 289.08
  4. Step 4: Simplify right side
    485.46x = 193,659.03
  5. Step 5: Solve for x
    x = 193,659.03/485.46
  6. Step 6: Final answer
    x = 398.92

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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.