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Finding the Fourth Proportional to 789.25, 1,090.53 and 649.25

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Solution

The fourth proportional to 789.25, 1,090.53 and 649.25 is: 897.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.25 : 1,090.53 = 649.25 : x
  2. Step 2: Convert to fraction form
    789.25/1,090.53 = 649.25/x
  3. Step 3: Cross multiply
    789.25x = 1,090.53 × 649.25
  4. Step 4: Simplify right side
    789.25x = 708,026.60
  5. Step 5: Solve for x
    x = 708,026.60/789.25
  6. Step 6: Final answer
    x = 897.09

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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.