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Finding the Fourth Proportional to 766.96, 1,057.93 and 668.95

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Solution

The fourth proportional to 766.96, 1,057.93 and 668.95 is: 922.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    766.96 : 1,057.93 = 668.95 : x
  2. Step 2: Convert to fraction form
    766.96/1,057.93 = 668.95/x
  3. Step 3: Cross multiply
    766.96x = 1,057.93 × 668.95
  4. Step 4: Simplify right side
    766.96x = 707,702.27
  5. Step 5: Solve for x
    x = 707,702.27/766.96
  6. Step 6: Final answer
    x = 922.74

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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.