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Finding the Fourth Proportional to 739.76, 1,109.81 and 219.75

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Solution

The fourth proportional to 739.76, 1,109.81 and 219.75 is: 329.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    739.76 : 1,109.81 = 219.75 : x
  2. Step 2: Convert to fraction form
    739.76/1,109.81 = 219.75/x
  3. Step 3: Cross multiply
    739.76x = 1,109.81 × 219.75
  4. Step 4: Simplify right side
    739.76x = 243,880.75
  5. Step 5: Solve for x
    x = 243,880.75/739.76
  6. Step 6: Final answer
    x = 329.68

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1.5x scale

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.