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Finding the Fourth Proportional to 665.31, 998.31 and 372.63

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Solution

The fourth proportional to 665.31, 998.31 and 372.63 is: 559.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.31 : 998.31 = 372.63 : x
  2. Step 2: Convert to fraction form
    665.31/998.31 = 372.63/x
  3. Step 3: Cross multiply
    665.31x = 998.31 × 372.63
  4. Step 4: Simplify right side
    665.31x = 372,005.40
  5. Step 5: Solve for x
    x = 372,005.40/665.31
  6. Step 6: Final answer
    x = 559.14

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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.