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Finding the Fourth Proportional to 1,121.64, 1,682.44 and 662.60

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Solution

The fourth proportional to 1,121.64, 1,682.44 and 662.60 is: 993.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.64 : 1,682.44 = 662.60 : x
  2. Step 2: Convert to fraction form
    1,121.64/1,682.44 = 662.60/x
  3. Step 3: Cross multiply
    1,121.64x = 1,682.44 × 662.60
  4. Step 4: Simplify right side
    1,121.64x = 1,114,784.74
  5. Step 5: Solve for x
    x = 1,114,784.74/1,121.64
  6. Step 6: Final answer
    x = 993.89

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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.