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Finding the Fourth Proportional to 511.09, 766.60 and 438.46

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Solution

The fourth proportional to 511.09, 766.60 and 438.46 is: 657.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    511.09 : 766.60 = 438.46 : x
  2. Step 2: Convert to fraction form
    511.09/766.60 = 438.46/x
  3. Step 3: Cross multiply
    511.09x = 766.60 × 438.46
  4. Step 4: Simplify right side
    511.09x = 336,120.42
  5. Step 5: Solve for x
    x = 336,120.42/511.09
  6. Step 6: Final answer
    x = 657.66

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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.