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Finding the Fourth Proportional to 772.62, 1,065.60 and 668.94

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Solution

The fourth proportional to 772.62, 1,065.60 and 668.94 is: 922.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.62 : 1,065.60 = 668.94 : x
  2. Step 2: Convert to fraction form
    772.62/1,065.60 = 668.94/x
  3. Step 3: Cross multiply
    772.62x = 1,065.60 × 668.94
  4. Step 4: Simplify right side
    772.62x = 712,822.46
  5. Step 5: Solve for x
    x = 712,822.46/772.62
  6. Step 6: Final answer
    x = 922.60

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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.