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Finding the Fourth Proportional to 443.61, 665.32 and 421.65

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Solution

The fourth proportional to 443.61, 665.32 and 421.65 is: 632.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    443.61 : 665.32 = 421.65 : x
  2. Step 2: Convert to fraction form
    443.61/665.32 = 421.65/x
  3. Step 3: Cross multiply
    443.61x = 665.32 × 421.65
  4. Step 4: Simplify right side
    443.61x = 280,532.18
  5. Step 5: Solve for x
    x = 280,532.18/443.61
  6. Step 6: Final answer
    x = 632.38

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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.