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Finding the Fourth Proportional to 355.09, 489.81 and 261.67

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Solution

The fourth proportional to 355.09, 489.81 and 261.67 is: 360.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.09 : 489.81 = 261.67 : x
  2. Step 2: Convert to fraction form
    355.09/489.81 = 261.67/x
  3. Step 3: Cross multiply
    355.09x = 489.81 × 261.67
  4. Step 4: Simplify right side
    355.09x = 128,166.13
  5. Step 5: Solve for x
    x = 128,166.13/355.09
  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.