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Finding the Fourth Proportional to 1,000.90, 1,379.07 and 668.75

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Solution

The fourth proportional to 1,000.90, 1,379.07 and 668.75 is: 921.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,000.90 : 1,379.07 = 668.75 : x
  2. Step 2: Convert to fraction form
    1,000.90/1,379.07 = 668.75/x
  3. Step 3: Cross multiply
    1,000.90x = 1,379.07 × 668.75
  4. Step 4: Simplify right side
    1,000.90x = 922,253.06
  5. Step 5: Solve for x
    x = 922,253.06/1,000.90
  6. Step 6: Final answer
    x = 921.42

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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.