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Finding the Fourth Proportional to 1,000.64, 1,380.39 and 669.15

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Solution

The fourth proportional to 1,000.64, 1,380.39 and 669.15 is: 923.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,000.64 : 1,380.39 = 669.15 : x
  2. Step 2: Convert to fraction form
    1,000.64/1,380.39 = 669.15/x
  3. Step 3: Cross multiply
    1,000.64x = 1,380.39 × 669.15
  4. Step 4: Simplify right side
    1,000.64x = 923,687.97
  5. Step 5: Solve for x
    x = 923,687.97/1,000.64
  6. Step 6: Final answer
    x = 923.10

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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.