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Finding the Fourth Proportional to 681.10, 933.80 and 668.80

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Solution

The fourth proportional to 681.10, 933.80 and 668.80 is: 916.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.10 : 933.80 = 668.80 : x
  2. Step 2: Convert to fraction form
    681.10/933.80 = 668.80/x
  3. Step 3: Cross multiply
    681.10x = 933.80 × 668.80
  4. Step 4: Simplify right side
    681.10x = 624,524.02
  5. Step 5: Solve for x
    x = 624,524.02/681.10
  6. Step 6: Final answer
    x = 916.93

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.