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Finding the Fourth Proportional to 1,219.64, 1,682.88 and 722.30

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Solution

The fourth proportional to 1,219.64, 1,682.88 and 722.30 is: 996.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,219.64 : 1,682.88 = 722.30 : x
  2. Step 2: Convert to fraction form
    1,219.64/1,682.88 = 722.30/x
  3. Step 3: Cross multiply
    1,219.64x = 1,682.88 × 722.30
  4. Step 4: Simplify right side
    1,219.64x = 1,215,544.22
  5. Step 5: Solve for x
    x = 1,215,544.22/1,219.64
  6. Step 6: Final answer
    x = 996.64

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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.