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Finding the Fourth Proportional to 443.49, 665.24 and 431.34

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Solution

The fourth proportional to 443.49, 665.24 and 431.34 is: 647.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    443.49 : 665.24 = 431.34 : x
  2. Step 2: Convert to fraction form
    443.49/665.24 = 431.34/x
  3. Step 3: Cross multiply
    443.49x = 665.24 × 431.34
  4. Step 4: Simplify right side
    443.49x = 286,942.46
  5. Step 5: Solve for x
    x = 286,942.46/443.49
  6. Step 6: Final answer
    x = 647.01

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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.