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Finding the Fourth Proportional to 789.76, 1,181.40 and 543.52

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Solution

The fourth proportional to 789.76, 1,181.40 and 543.52 is: 813.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.76 : 1,181.40 = 543.52 : x
  2. Step 2: Convert to fraction form
    789.76/1,181.40 = 543.52/x
  3. Step 3: Cross multiply
    789.76x = 1,181.40 × 543.52
  4. Step 4: Simplify right side
    789.76x = 642,114.53
  5. Step 5: Solve for x
    x = 642,114.53/789.76
  6. Step 6: Final answer
    x = 813.05

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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.