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Finding the Fourth Proportional to 934.63, 1,290.87 and 639.38

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Solution

The fourth proportional to 934.63, 1,290.87 and 639.38 is: 883.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    934.63 : 1,290.87 = 639.38 : x
  2. Step 2: Convert to fraction form
    934.63/1,290.87 = 639.38/x
  3. Step 3: Cross multiply
    934.63x = 1,290.87 × 639.38
  4. Step 4: Simplify right side
    934.63x = 825,353.26
  5. Step 5: Solve for x
    x = 825,353.26/934.63
  6. Step 6: Final answer
    x = 883.08

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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.