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Finding the Fourth Proportional to 443.61, 665.50 and 212.34

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Solution

The fourth proportional to 443.61, 665.50 and 212.34 is: 318.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    443.61 : 665.50 = 212.34 : x
  2. Step 2: Convert to fraction form
    443.61/665.50 = 212.34/x
  3. Step 3: Cross multiply
    443.61x = 665.50 × 212.34
  4. Step 4: Simplify right side
    443.61x = 141,313.93
  5. Step 5: Solve for x
    x = 141,313.93/443.61
  6. Step 6: Final answer
    x = 318.55

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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.