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Finding the Fourth Proportional to 1,193.62, 1,790.95 and 639.58

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Solution

The fourth proportional to 1,193.62, 1,790.95 and 639.58 is: 959.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,193.62 : 1,790.95 = 639.58 : x
  2. Step 2: Convert to fraction form
    1,193.62/1,790.95 = 639.58/x
  3. Step 3: Cross multiply
    1,193.62x = 1,790.95 × 639.58
  4. Step 4: Simplify right side
    1,193.62x = 1,145,460.94
  5. Step 5: Solve for x
    x = 1,145,460.94/1,193.62
  6. Step 6: Final answer
    x = 959.65

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.