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Finding the Fourth Proportional to 666.20, 998.97 and 357.98

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Solution

The fourth proportional to 666.20, 998.97 and 357.98 is: 536.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.20 : 998.97 = 357.98 : x
  2. Step 2: Convert to fraction form
    666.20/998.97 = 357.98/x
  3. Step 3: Cross multiply
    666.20x = 998.97 × 357.98
  4. Step 4: Simplify right side
    666.20x = 357,606.29
  5. Step 5: Solve for x
    x = 357,606.29/666.20
  6. Step 6: Final answer
    x = 536.79

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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.