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Finding the Fourth Proportional to 443.34, 665.82 and 421.47

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Solution

The fourth proportional to 443.34, 665.82 and 421.47 is: 632.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    443.34 : 665.82 = 421.47 : x
  2. Step 2: Convert to fraction form
    443.34/665.82 = 421.47/x
  3. Step 3: Cross multiply
    443.34x = 665.82 × 421.47
  4. Step 4: Simplify right side
    443.34x = 280,623.16
  5. Step 5: Solve for x
    x = 280,623.16/443.34
  6. Step 6: Final answer
    x = 632.98

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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.