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Finding the Fourth Proportional to 511.19, 766.98 and 218.75

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Solution

The fourth proportional to 511.19, 766.98 and 218.75 is: 328.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    511.19 : 766.98 = 218.75 : x
  2. Step 2: Convert to fraction form
    511.19/766.98 = 218.75/x
  3. Step 3: Cross multiply
    511.19x = 766.98 × 218.75
  4. Step 4: Simplify right side
    511.19x = 167,776.88
  5. Step 5: Solve for x
    x = 167,776.88/511.19
  6. Step 6: Final answer
    x = 328.21

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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.