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Finding the Fourth Proportional to 789.97, 1,090.26 and 479.47

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Solution

The fourth proportional to 789.97, 1,090.26 and 479.47 is: 661.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.97 : 1,090.26 = 479.47 : x
  2. Step 2: Convert to fraction form
    789.97/1,090.26 = 479.47/x
  3. Step 3: Cross multiply
    789.97x = 1,090.26 × 479.47
  4. Step 4: Simplify right side
    789.97x = 522,746.96
  5. Step 5: Solve for x
    x = 522,746.96/789.97
  6. Step 6: Final answer
    x = 661.73

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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.