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Finding the Fourth Proportional to 665.89, 998.88 and 485.44

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Solution

The fourth proportional to 665.89, 998.88 and 485.44 is: 728.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.89 : 998.88 = 485.44 : x
  2. Step 2: Convert to fraction form
    665.89/998.88 = 485.44/x
  3. Step 3: Cross multiply
    665.89x = 998.88 × 485.44
  4. Step 4: Simplify right side
    665.89x = 484,896.31
  5. Step 5: Solve for x
    x = 484,896.31/665.89
  6. Step 6: Final answer
    x = 728.19

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.