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Finding the Fourth Proportional to 768.12, 1,059.99 and 418.80

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Solution

The fourth proportional to 768.12, 1,059.99 and 418.80 is: 577.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.12 : 1,059.99 = 418.80 : x
  2. Step 2: Convert to fraction form
    768.12/1,059.99 = 418.80/x
  3. Step 3: Cross multiply
    768.12x = 1,059.99 × 418.80
  4. Step 4: Simplify right side
    768.12x = 443,923.81
  5. Step 5: Solve for x
    x = 443,923.81/768.12
  6. Step 6: Final answer
    x = 577.94

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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.