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Finding the Fourth Proportional to 778.88, 1,074.93 and 668.72

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Solution

The fourth proportional to 778.88, 1,074.93 and 668.72 is: 922.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.88 : 1,074.93 = 668.72 : x
  2. Step 2: Convert to fraction form
    778.88/1,074.93 = 668.72/x
  3. Step 3: Cross multiply
    778.88x = 1,074.93 × 668.72
  4. Step 4: Simplify right side
    778.88x = 718,827.19
  5. Step 5: Solve for x
    x = 718,827.19/778.88
  6. Step 6: Final answer
    x = 922.90

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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.