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Finding the Fourth Proportional to 1,000.89, 1,382.36 and 668.75

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Solution

The fourth proportional to 1,000.89, 1,382.36 and 668.75 is: 923.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,000.89 : 1,382.36 = 668.75 : x
  2. Step 2: Convert to fraction form
    1,000.89/1,382.36 = 668.75/x
  3. Step 3: Cross multiply
    1,000.89x = 1,382.36 × 668.75
  4. Step 4: Simplify right side
    1,000.89x = 924,442.99
  5. Step 5: Solve for x
    x = 924,442.99/1,000.89
  6. Step 6: Final answer
    x = 923.62

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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.