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Finding the Fourth Proportional to 519.21, 779.76 and 454.95

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Solution

The fourth proportional to 519.21, 779.76 and 454.95 is: 683.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.21 : 779.76 = 454.95 : x
  2. Step 2: Convert to fraction form
    519.21/779.76 = 454.95/x
  3. Step 3: Cross multiply
    519.21x = 779.76 × 454.95
  4. Step 4: Simplify right side
    519.21x = 354,751.81
  5. Step 5: Solve for x
    x = 354,751.81/519.21
  6. Step 6: Final answer
    x = 683.25

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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.