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Finding the Fourth Proportional to 1,188.20, 1,783.55 and 668.66

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Solution

The fourth proportional to 1,188.20, 1,783.55 and 668.66 is: 1,003.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,188.20 : 1,783.55 = 668.66 : x
  2. Step 2: Convert to fraction form
    1,188.20/1,783.55 = 668.66/x
  3. Step 3: Cross multiply
    1,188.20x = 1,783.55 × 668.66
  4. Step 4: Simplify right side
    1,188.20x = 1,192,581.30
  5. Step 5: Solve for x
    x = 1,192,581.30/1,188.20
  6. Step 6: Final answer
    x = 1,003.69

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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.