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Finding the Fourth Proportional to 666.36, 998.62 and 319.56

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Solution

The fourth proportional to 666.36, 998.62 and 319.56 is: 478.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.36 : 998.62 = 319.56 : x
  2. Step 2: Convert to fraction form
    666.36/998.62 = 319.56/x
  3. Step 3: Cross multiply
    666.36x = 998.62 × 319.56
  4. Step 4: Simplify right side
    666.36x = 319,119.01
  5. Step 5: Solve for x
    x = 319,119.01/666.36
  6. Step 6: Final answer
    x = 478.90

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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.