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Finding the Fourth Proportional to 665.64, 999.08 and 449.38

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Solution

The fourth proportional to 665.64, 999.08 and 449.38 is: 674.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.64 : 999.08 = 449.38 : x
  2. Step 2: Convert to fraction form
    665.64/999.08 = 449.38/x
  3. Step 3: Cross multiply
    665.64x = 999.08 × 449.38
  4. Step 4: Simplify right side
    665.64x = 448,966.57
  5. Step 5: Solve for x
    x = 448,966.57/665.64
  6. Step 6: Final answer
    x = 674.49

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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.