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Finding the Fourth Proportional to 665.85, 999.18 and 300.68

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Solution

The fourth proportional to 665.85, 999.18 and 300.68 is: 451.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.85 : 999.18 = 300.68 : x
  2. Step 2: Convert to fraction form
    665.85/999.18 = 300.68/x
  3. Step 3: Cross multiply
    665.85x = 999.18 × 300.68
  4. Step 4: Simplify right side
    665.85x = 300,428.45
  5. Step 5: Solve for x
    x = 300,428.45/665.85
  6. Step 6: Final answer
    x = 451.20

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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.