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Finding the Fourth Proportional to 935.15, 1,289.86 and 640.04

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Solution

The fourth proportional to 935.15, 1,289.86 and 640.04 is: 882.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    935.15 : 1,289.86 = 640.04 : x
  2. Step 2: Convert to fraction form
    935.15/1,289.86 = 640.04/x
  3. Step 3: Cross multiply
    935.15x = 1,289.86 × 640.04
  4. Step 4: Simplify right side
    935.15x = 825,553.95
  5. Step 5: Solve for x
    x = 825,553.95/935.15
  6. Step 6: Final answer
    x = 882.81

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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.