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Finding the Fourth Proportional to 1,000.09, 1,380.33 and 668.26

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Solution

The fourth proportional to 1,000.09, 1,380.33 and 668.26 is: 922.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,000.09 : 1,380.33 = 668.26 : x
  2. Step 2: Convert to fraction form
    1,000.09/1,380.33 = 668.26/x
  3. Step 3: Cross multiply
    1,000.09x = 1,380.33 × 668.26
  4. Step 4: Simplify right side
    1,000.09x = 922,409.08
  5. Step 5: Solve for x
    x = 922,409.08/1,000.09
  6. Step 6: Final answer
    x = 922.33

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Double scale
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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.