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Finding the Fourth Proportional to 660.13, 911.16 and 394.67

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Solution

The fourth proportional to 660.13, 911.16 and 394.67 is: 544.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.13 : 911.16 = 394.67 : x
  2. Step 2: Convert to fraction form
    660.13/911.16 = 394.67/x
  3. Step 3: Cross multiply
    660.13x = 911.16 × 394.67
  4. Step 4: Simplify right side
    660.13x = 359,607.52
  5. Step 5: Solve for x
    x = 359,607.52/660.13
  6. Step 6: Final answer
    x = 544.75

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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.