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Finding the Fourth Proportional to 319.40, 440.60 and 261.08

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Solution

The fourth proportional to 319.40, 440.60 and 261.08 is: 360.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.40 : 440.60 = 261.08 : x
  2. Step 2: Convert to fraction form
    319.40/440.60 = 261.08/x
  3. Step 3: Cross multiply
    319.40x = 440.60 × 261.08
  4. Step 4: Simplify right side
    319.40x = 115,031.85
  5. Step 5: Solve for x
    x = 115,031.85/319.40
  6. Step 6: Final answer
    x = 360.15

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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.