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Finding the Fourth Proportional to 485.89, 670.67 and 289.54

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Solution

The fourth proportional to 485.89, 670.67 and 289.54 is: 399.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.89 : 670.67 = 289.54 : x
  2. Step 2: Convert to fraction form
    485.89/670.67 = 289.54/x
  3. Step 3: Cross multiply
    485.89x = 670.67 × 289.54
  4. Step 4: Simplify right side
    485.89x = 194,185.79
  5. Step 5: Solve for x
    x = 194,185.79/485.89
  6. Step 6: Final answer
    x = 399.65

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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.