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Finding the Fourth Proportional to 442.77, 665.08 and 427.42

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Solution

The fourth proportional to 442.77, 665.08 and 427.42 is: 642.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    442.77 : 665.08 = 427.42 : x
  2. Step 2: Convert to fraction form
    442.77/665.08 = 427.42/x
  3. Step 3: Cross multiply
    442.77x = 665.08 × 427.42
  4. Step 4: Simplify right side
    442.77x = 284,268.49
  5. Step 5: Solve for x
    x = 284,268.49/442.77
  6. Step 6: Final answer
    x = 642.02

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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.