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Finding the Fourth Proportional to 681.90, 941.08 and 387.22

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Solution

The fourth proportional to 681.90, 941.08 and 387.22 is: 534.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.90 : 941.08 = 387.22 : x
  2. Step 2: Convert to fraction form
    681.90/941.08 = 387.22/x
  3. Step 3: Cross multiply
    681.90x = 941.08 × 387.22
  4. Step 4: Simplify right side
    681.90x = 364,405.00
  5. Step 5: Solve for x
    x = 364,405.00/681.90
  6. Step 6: Final answer
    x = 534.40

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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.