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Finding the Fourth Proportional to 665.37, 997.23 and 391.66

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Solution

The fourth proportional to 665.37, 997.23 and 391.66 is: 587.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.37 : 997.23 = 391.66 : x
  2. Step 2: Convert to fraction form
    665.37/997.23 = 391.66/x
  3. Step 3: Cross multiply
    665.37x = 997.23 × 391.66
  4. Step 4: Simplify right side
    665.37x = 390,575.10
  5. Step 5: Solve for x
    x = 390,575.10/665.37
  6. Step 6: Final answer
    x = 587.00

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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.