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Finding the Fourth Proportional to 485.73, 670.08 and 308.64

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Solution

The fourth proportional to 485.73, 670.08 and 308.64 is: 425.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.73 : 670.08 = 308.64 : x
  2. Step 2: Convert to fraction form
    485.73/670.08 = 308.64/x
  3. Step 3: Cross multiply
    485.73x = 670.08 × 308.64
  4. Step 4: Simplify right side
    485.73x = 206,813.49
  5. Step 5: Solve for x
    x = 206,813.49/485.73
  6. Step 6: Final answer
    x = 425.78

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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.