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Finding the Fourth Proportional to 1,000.46, 1,380.84 and 668.63

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Solution

The fourth proportional to 1,000.46, 1,380.84 and 668.63 is: 922.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,000.46 : 1,380.84 = 668.63 : x
  2. Step 2: Convert to fraction form
    1,000.46/1,380.84 = 668.63/x
  3. Step 3: Cross multiply
    1,000.46x = 1,380.84 × 668.63
  4. Step 4: Simplify right side
    1,000.46x = 923,271.05
  5. Step 5: Solve for x
    x = 923,271.05/1,000.46
  6. Step 6: Final answer
    x = 922.85

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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.