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Finding the Fourth Proportional to 789.37, 1,089.43 and 453.40

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Solution

The fourth proportional to 789.37, 1,089.43 and 453.40 is: 625.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.37 : 1,089.43 = 453.40 : x
  2. Step 2: Convert to fraction form
    789.37/1,089.43 = 453.40/x
  3. Step 3: Cross multiply
    789.37x = 1,089.43 × 453.40
  4. Step 4: Simplify right side
    789.37x = 493,945.30
  5. Step 5: Solve for x
    x = 493,945.30/789.37
  6. Step 6: Final answer
    x = 625.75

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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.