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Finding the Fourth Proportional to 442.08, 663.21 and 386.73

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Solution

The fourth proportional to 442.08, 663.21 and 386.73 is: 580.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    442.08 : 663.21 = 386.73 : x
  2. Step 2: Convert to fraction form
    442.08/663.21 = 386.73/x
  3. Step 3: Cross multiply
    442.08x = 663.21 × 386.73
  4. Step 4: Simplify right side
    442.08x = 256,483.20
  5. Step 5: Solve for x
    x = 256,483.20/442.08
  6. Step 6: Final answer
    x = 580.17

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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.