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Finding the Fourth Proportional to 665.12, 997.67 and 318.30

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Solution

The fourth proportional to 665.12, 997.67 and 318.30 is: 477.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.12 : 997.67 = 318.30 : x
  2. Step 2: Convert to fraction form
    665.12/997.67 = 318.30/x
  3. Step 3: Cross multiply
    665.12x = 997.67 × 318.30
  4. Step 4: Simplify right side
    665.12x = 317,559.16
  5. Step 5: Solve for x
    x = 317,559.16/665.12
  6. Step 6: Final answer
    x = 477.45

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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.