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Finding the Fourth Proportional to 940.20, 1,297.08 and 644.82

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Solution

The fourth proportional to 940.20, 1,297.08 and 644.82 is: 889.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    940.20 : 1,297.08 = 644.82 : x
  2. Step 2: Convert to fraction form
    940.20/1,297.08 = 644.82/x
  3. Step 3: Cross multiply
    940.20x = 1,297.08 × 644.82
  4. Step 4: Simplify right side
    940.20x = 836,383.13
  5. Step 5: Solve for x
    x = 836,383.13/940.20
  6. Step 6: Final answer
    x = 889.58

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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.