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Finding the Fourth Proportional to 681.61, 941.16 and 445.72

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Solution

The fourth proportional to 681.61, 941.16 and 445.72 is: 615.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.61 : 941.16 = 445.72 : x
  2. Step 2: Convert to fraction form
    681.61/941.16 = 445.72/x
  3. Step 3: Cross multiply
    681.61x = 941.16 × 445.72
  4. Step 4: Simplify right side
    681.61x = 419,493.84
  5. Step 5: Solve for x
    x = 419,493.84/681.61
  6. Step 6: Final answer
    x = 615.45

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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.