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Finding the Fourth Proportional to 631.17, 940.79 and 611.28

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Solution

The fourth proportional to 631.17, 940.79 and 611.28 is: 911.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.17 : 940.79 = 611.28 : x
  2. Step 2: Convert to fraction form
    631.17/940.79 = 611.28/x
  3. Step 3: Cross multiply
    631.17x = 940.79 × 611.28
  4. Step 4: Simplify right side
    631.17x = 575,087.64
  5. Step 5: Solve for x
    x = 575,087.64/631.17
  6. Step 6: Final answer
    x = 911.15

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.