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Finding the Fourth Proportional to 660.42, 911.61 and 411.98

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Solution

The fourth proportional to 660.42, 911.61 and 411.98 is: 568.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.42 : 911.61 = 411.98 : x
  2. Step 2: Convert to fraction form
    660.42/911.61 = 411.98/x
  3. Step 3: Cross multiply
    660.42x = 911.61 × 411.98
  4. Step 4: Simplify right side
    660.42x = 375,560.53
  5. Step 5: Solve for x
    x = 375,560.53/660.42
  6. Step 6: Final answer
    x = 568.67

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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.