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Finding the Fourth Proportional to 777.74, 1,072.86 and 668.66

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Solution

The fourth proportional to 777.74, 1,072.86 and 668.66 is: 922.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    777.74 : 1,072.86 = 668.66 : x
  2. Step 2: Convert to fraction form
    777.74/1,072.86 = 668.66/x
  3. Step 3: Cross multiply
    777.74x = 1,072.86 × 668.66
  4. Step 4: Simplify right side
    777.74x = 717,378.57
  5. Step 5: Solve for x
    x = 717,378.57/777.74
  6. Step 6: Final answer
    x = 922.39

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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.