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Finding the Fourth Proportional to 660.14, 911.03 and 438.93

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Solution

The fourth proportional to 660.14, 911.03 and 438.93 is: 605.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.14 : 911.03 = 438.93 : x
  2. Step 2: Convert to fraction form
    660.14/911.03 = 438.93/x
  3. Step 3: Cross multiply
    660.14x = 911.03 × 438.93
  4. Step 4: Simplify right side
    660.14x = 399,876.20
  5. Step 5: Solve for x
    x = 399,876.20/660.14
  6. Step 6: Final answer
    x = 605.75

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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.