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Finding the Fourth Proportional to 934.75, 1,289.55 and 639.91

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Solution

The fourth proportional to 934.75, 1,289.55 and 639.91 is: 882.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    934.75 : 1,289.55 = 639.91 : x
  2. Step 2: Convert to fraction form
    934.75/1,289.55 = 639.91/x
  3. Step 3: Cross multiply
    934.75x = 1,289.55 × 639.91
  4. Step 4: Simplify right side
    934.75x = 825,195.94
  5. Step 5: Solve for x
    x = 825,195.94/934.75
  6. Step 6: Final answer
    x = 882.80

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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.