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Finding the Fourth Proportional to 1,000.85, 1,381.10 and 668.97

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Solution

The fourth proportional to 1,000.85, 1,381.10 and 668.97 is: 923.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,000.85 : 1,381.10 = 668.97 : x
  2. Step 2: Convert to fraction form
    1,000.85/1,381.10 = 668.97/x
  3. Step 3: Cross multiply
    1,000.85x = 1,381.10 × 668.97
  4. Step 4: Simplify right side
    1,000.85x = 923,911.12
  5. Step 5: Solve for x
    x = 923,911.12/1,000.85
  6. Step 6: Final answer
    x = 923.13

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1.5x scale

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.