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Finding the Fourth Proportional to 1,188.44, 1,639.20 and 722.72

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Solution

The fourth proportional to 1,188.44, 1,639.20 and 722.72 is: 996.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,188.44 : 1,639.20 = 722.72 : x
  2. Step 2: Convert to fraction form
    1,188.44/1,639.20 = 722.72/x
  3. Step 3: Cross multiply
    1,188.44x = 1,639.20 × 722.72
  4. Step 4: Simplify right side
    1,188.44x = 1,184,682.62
  5. Step 5: Solve for x
    x = 1,184,682.62/1,188.44
  6. Step 6: Final answer
    x = 996.84

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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.