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Finding the Fourth Proportional to 665.51, 998.20 and 415.37

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Solution

The fourth proportional to 665.51, 998.20 and 415.37 is: 623.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.51 : 998.20 = 415.37 : x
  2. Step 2: Convert to fraction form
    665.51/998.20 = 415.37/x
  3. Step 3: Cross multiply
    665.51x = 998.20 × 415.37
  4. Step 4: Simplify right side
    665.51x = 414,615.27
  5. Step 5: Solve for x
    x = 414,615.27/665.51
  6. Step 6: Final answer
    x = 623.01

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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.