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Finding the Fourth Proportional to 789.97, 1,090.21 and 440.66

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Solution

The fourth proportional to 789.97, 1,090.21 and 440.66 is: 608.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.97 : 1,090.21 = 440.66 : x
  2. Step 2: Convert to fraction form
    789.97/1,090.21 = 440.66/x
  3. Step 3: Cross multiply
    789.97x = 1,090.21 × 440.66
  4. Step 4: Simplify right side
    789.97x = 480,411.94
  5. Step 5: Solve for x
    x = 480,411.94/789.97
  6. Step 6: Final answer
    x = 608.14

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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.