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Finding the Fourth Proportional to 511.44, 766.20 and 419.28

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Solution

The fourth proportional to 511.44, 766.20 and 419.28 is: 628.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    511.44 : 766.20 = 419.28 : x
  2. Step 2: Convert to fraction form
    511.44/766.20 = 419.28/x
  3. Step 3: Cross multiply
    511.44x = 766.20 × 419.28
  4. Step 4: Simplify right side
    511.44x = 321,252.34
  5. Step 5: Solve for x
    x = 321,252.34/511.44
  6. Step 6: Final answer
    x = 628.13

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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.