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Finding the Fourth Proportional to 774.75, 1,069.16 and 420.68

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Solution

The fourth proportional to 774.75, 1,069.16 and 420.68 is: 580.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    774.75 : 1,069.16 = 420.68 : x
  2. Step 2: Convert to fraction form
    774.75/1,069.16 = 420.68/x
  3. Step 3: Cross multiply
    774.75x = 1,069.16 × 420.68
  4. Step 4: Simplify right side
    774.75x = 449,769.93
  5. Step 5: Solve for x
    x = 449,769.93/774.75
  6. Step 6: Final answer
    x = 580.53

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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.