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Finding the Fourth Proportional to 940.35, 1,297.04 and 661.17

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Solution

The fourth proportional to 940.35, 1,297.04 and 661.17 is: 911.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    940.35 : 1,297.04 = 661.17 : x
  2. Step 2: Convert to fraction form
    940.35/1,297.04 = 661.17/x
  3. Step 3: Cross multiply
    940.35x = 1,297.04 × 661.17
  4. Step 4: Simplify right side
    940.35x = 857,560.63
  5. Step 5: Solve for x
    x = 857,560.63/940.35
  6. Step 6: Final answer
    x = 911.96

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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.