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Finding the Fourth Proportional to 665.32, 998.36 and 318.61

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Solution

The fourth proportional to 665.32, 998.36 and 318.61 is: 478.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.32 : 998.36 = 318.61 : x
  2. Step 2: Convert to fraction form
    665.32/998.36 = 318.61/x
  3. Step 3: Cross multiply
    665.32x = 998.36 × 318.61
  4. Step 4: Simplify right side
    665.32x = 318,087.48
  5. Step 5: Solve for x
    x = 318,087.48/665.32
  6. Step 6: Final answer
    x = 478.10

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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.