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Finding the Fourth Proportional to 443.75, 665.78 and 290.03

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Solution

The fourth proportional to 443.75, 665.78 and 290.03 is: 435.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    443.75 : 665.78 = 290.03 : x
  2. Step 2: Convert to fraction form
    443.75/665.78 = 290.03/x
  3. Step 3: Cross multiply
    443.75x = 665.78 × 290.03
  4. Step 4: Simplify right side
    443.75x = 193,091.39
  5. Step 5: Solve for x
    x = 193,091.39/443.75
  6. Step 6: Final answer
    x = 435.14

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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.