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Finding the Fourth Proportional to 443.45, 663.60 and 386.30

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Solution

The fourth proportional to 443.45, 663.60 and 386.30 is: 578.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    443.45 : 663.60 = 386.30 : x
  2. Step 2: Convert to fraction form
    443.45/663.60 = 386.30/x
  3. Step 3: Cross multiply
    443.45x = 663.60 × 386.30
  4. Step 4: Simplify right side
    443.45x = 256,348.68
  5. Step 5: Solve for x
    x = 256,348.68/443.45
  6. Step 6: Final answer
    x = 578.08

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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.