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Finding the Fourth Proportional to 766.59, 1,150.56 and 438.20

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Solution

The fourth proportional to 766.59, 1,150.56 and 438.20 is: 657.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    766.59 : 1,150.56 = 438.20 : x
  2. Step 2: Convert to fraction form
    766.59/1,150.56 = 438.20/x
  3. Step 3: Cross multiply
    766.59x = 1,150.56 × 438.20
  4. Step 4: Simplify right side
    766.59x = 504,169.64
  5. Step 5: Solve for x
    x = 504,169.64/766.59
  6. Step 6: Final answer
    x = 657.68

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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.