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Finding the Fourth Proportional to 1,188, 1,640.88 and 794.34

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Solution

The fourth proportional to 1,188, 1,640.88 and 794.34 is: 1,097.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,188 : 1,640.88 = 794.34 : x
  2. Step 2: Convert to fraction form
    1,188/1,640.88 = 794.34/x
  3. Step 3: Cross multiply
    1,188x = 1,640.88 × 794.34
  4. Step 4: Simplify right side
    1,188x = 1,303,416.62
  5. Step 5: Solve for x
    x = 1,303,416.62/1,188
  6. Step 6: Final answer
    x = 1,097.15

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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.