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Finding the Fourth Proportional to 307.86, 425.11 and 261.39

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Solution

The fourth proportional to 307.86, 425.11 and 261.39 is: 360.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    307.86 : 425.11 = 261.39 : x
  2. Step 2: Convert to fraction form
    307.86/425.11 = 261.39/x
  3. Step 3: Cross multiply
    307.86x = 425.11 × 261.39
  4. Step 4: Simplify right side
    307.86x = 111,119.50
  5. Step 5: Solve for x
    x = 111,119.50/307.86
  6. Step 6: Final answer
    x = 360.94

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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.