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Finding the Fourth Proportional to 935.62, 1,289.73 and 639.97

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Solution

The fourth proportional to 935.62, 1,289.73 and 639.97 is: 882.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    935.62 : 1,289.73 = 639.97 : x
  2. Step 2: Convert to fraction form
    935.62/1,289.73 = 639.97/x
  3. Step 3: Cross multiply
    935.62x = 1,289.73 × 639.97
  4. Step 4: Simplify right side
    935.62x = 825,388.51
  5. Step 5: Solve for x
    x = 825,388.51/935.62
  6. Step 6: Final answer
    x = 882.18

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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.