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Finding the Fourth Proportional to 665.36, 995.12 and 404.64

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Solution

The fourth proportional to 665.36, 995.12 and 404.64 is: 605.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.36 : 995.12 = 404.64 : x
  2. Step 2: Convert to fraction form
    665.36/995.12 = 404.64/x
  3. Step 3: Cross multiply
    665.36x = 995.12 × 404.64
  4. Step 4: Simplify right side
    665.36x = 402,665.36
  5. Step 5: Solve for x
    x = 402,665.36/665.36
  6. Step 6: Final answer
    x = 605.18

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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.