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Finding the Fourth Proportional to 438.30, 604.79 and 261.34

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Solution

The fourth proportional to 438.30, 604.79 and 261.34 is: 360.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.30 : 604.79 = 261.34 : x
  2. Step 2: Convert to fraction form
    438.30/604.79 = 261.34/x
  3. Step 3: Cross multiply
    438.30x = 604.79 × 261.34
  4. Step 4: Simplify right side
    438.30x = 158,055.82
  5. Step 5: Solve for x
    x = 158,055.82/438.30
  6. Step 6: Final answer
    x = 360.61

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.