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Finding the Fourth Proportional to 789.51, 1,184.36 and 423.79

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Solution

The fourth proportional to 789.51, 1,184.36 and 423.79 is: 635.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.51 : 1,184.36 = 423.79 : x
  2. Step 2: Convert to fraction form
    789.51/1,184.36 = 423.79/x
  3. Step 3: Cross multiply
    789.51x = 1,184.36 × 423.79
  4. Step 4: Simplify right side
    789.51x = 501,919.92
  5. Step 5: Solve for x
    x = 501,919.92/789.51
  6. Step 6: Final answer
    x = 635.74

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.