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Finding the Fourth Proportional to 442.60, 665.10 and 389.80

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Solution

The fourth proportional to 442.60, 665.10 and 389.80 is: 585.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    442.60 : 665.10 = 389.80 : x
  2. Step 2: Convert to fraction form
    442.60/665.10 = 389.80/x
  3. Step 3: Cross multiply
    442.60x = 665.10 × 389.80
  4. Step 4: Simplify right side
    442.60x = 259,255.98
  5. Step 5: Solve for x
    x = 259,255.98/442.60
  6. Step 6: Final answer
    x = 585.76

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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.