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Finding the Fourth Proportional to 681.68, 940.65 and 401.91

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Solution

The fourth proportional to 681.68, 940.65 and 401.91 is: 554.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.68 : 940.65 = 401.91 : x
  2. Step 2: Convert to fraction form
    681.68/940.65 = 401.91/x
  3. Step 3: Cross multiply
    681.68x = 940.65 × 401.91
  4. Step 4: Simplify right side
    681.68x = 378,056.64
  5. Step 5: Solve for x
    x = 378,056.64/681.68
  6. Step 6: Final answer
    x = 554.60

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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.