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Finding the Fourth Proportional to 943.28, 1,415.28 and 683.60

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Solution

The fourth proportional to 943.28, 1,415.28 and 683.60 is: 1,025.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    943.28 : 1,415.28 = 683.60 : x
  2. Step 2: Convert to fraction form
    943.28/1,415.28 = 683.60/x
  3. Step 3: Cross multiply
    943.28x = 1,415.28 × 683.60
  4. Step 4: Simplify right side
    943.28x = 967,478.33
  5. Step 5: Solve for x
    x = 967,478.33/943.28
  6. Step 6: Final answer
    x = 1,025.66

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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.