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Finding the Fourth Proportional to 681.76, 940.71 and 416.11

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Solution

The fourth proportional to 681.76, 940.71 and 416.11 is: 574.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.76 : 940.71 = 416.11 : x
  2. Step 2: Convert to fraction form
    681.76/940.71 = 416.11/x
  3. Step 3: Cross multiply
    681.76x = 940.71 × 416.11
  4. Step 4: Simplify right side
    681.76x = 391,438.84
  5. Step 5: Solve for x
    x = 391,438.84/681.76
  6. Step 6: Final answer
    x = 574.16

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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.