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Finding the Fourth Proportional to 442.80, 664.29 and 260.34

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Solution

The fourth proportional to 442.80, 664.29 and 260.34 is: 390.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    442.80 : 664.29 = 260.34 : x
  2. Step 2: Convert to fraction form
    442.80/664.29 = 260.34/x
  3. Step 3: Cross multiply
    442.80x = 664.29 × 260.34
  4. Step 4: Simplify right side
    442.80x = 172,941.26
  5. Step 5: Solve for x
    x = 172,941.26/442.80
  6. Step 6: Final answer
    x = 390.56

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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.