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Finding the Fourth Proportional to 660.44, 911.45 and 398.50

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Solution

The fourth proportional to 660.44, 911.45 and 398.50 is: 549.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.44 : 911.45 = 398.50 : x
  2. Step 2: Convert to fraction form
    660.44/911.45 = 398.50/x
  3. Step 3: Cross multiply
    660.44x = 911.45 × 398.50
  4. Step 4: Simplify right side
    660.44x = 363,212.83
  5. Step 5: Solve for x
    x = 363,212.83/660.44
  6. Step 6: Final answer
    x = 549.96

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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.