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Finding the Fourth Proportional to 443.47, 665.21 and 135.30

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Solution

The fourth proportional to 443.47, 665.21 and 135.30 is: 202.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    443.47 : 665.21 = 135.30 : x
  2. Step 2: Convert to fraction form
    443.47/665.21 = 135.30/x
  3. Step 3: Cross multiply
    443.47x = 665.21 × 135.30
  4. Step 4: Simplify right side
    443.47x = 90,000.76
  5. Step 5: Solve for x
    x = 90,000.76/443.47
  6. Step 6: Final answer
    x = 202.95

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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.