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Finding the Fourth Proportional to 789.42, 1,184.66 and 545.51

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Solution

The fourth proportional to 789.42, 1,184.66 and 545.51 is: 818.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.42 : 1,184.66 = 545.51 : x
  2. Step 2: Convert to fraction form
    789.42/1,184.66 = 545.51/x
  3. Step 3: Cross multiply
    789.42x = 1,184.66 × 545.51
  4. Step 4: Simplify right side
    789.42x = 646,243.88
  5. Step 5: Solve for x
    x = 646,243.88/789.42
  6. Step 6: Final answer
    x = 818.63

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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.