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Finding the Fourth Proportional to 665.10, 997.34 and 391.32

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Solution

The fourth proportional to 665.10, 997.34 and 391.32 is: 586.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.10 : 997.34 = 391.32 : x
  2. Step 2: Convert to fraction form
    665.10/997.34 = 391.32/x
  3. Step 3: Cross multiply
    665.10x = 997.34 × 391.32
  4. Step 4: Simplify right side
    665.10x = 390,277.13
  5. Step 5: Solve for x
    x = 390,277.13/665.10
  6. Step 6: Final answer
    x = 586.79

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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.