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Finding the Fourth Proportional to 665.61, 998.70 and 254.80

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Solution

The fourth proportional to 665.61, 998.70 and 254.80 is: 382.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.61 : 998.70 = 254.80 : x
  2. Step 2: Convert to fraction form
    665.61/998.70 = 254.80/x
  3. Step 3: Cross multiply
    665.61x = 998.70 × 254.80
  4. Step 4: Simplify right side
    665.61x = 254,468.76
  5. Step 5: Solve for x
    x = 254,468.76/665.61
  6. Step 6: Final answer
    x = 382.31

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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.