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Finding the Fourth Proportional to 443.47, 665.10 and 290.47

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Solution

The fourth proportional to 443.47, 665.10 and 290.47 is: 435.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    443.47 : 665.10 = 290.47 : x
  2. Step 2: Convert to fraction form
    443.47/665.10 = 290.47/x
  3. Step 3: Cross multiply
    443.47x = 665.10 × 290.47
  4. Step 4: Simplify right side
    443.47x = 193,191.60
  5. Step 5: Solve for x
    x = 193,191.60/443.47
  6. Step 6: Final answer
    x = 435.64

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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.