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Finding the Fourth Proportional to 746.28, 1,119.78 and 313.38

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Solution

The fourth proportional to 746.28, 1,119.78 and 313.38 is: 470.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    746.28 : 1,119.78 = 313.38 : x
  2. Step 2: Convert to fraction form
    746.28/1,119.78 = 313.38/x
  3. Step 3: Cross multiply
    746.28x = 1,119.78 × 313.38
  4. Step 4: Simplify right side
    746.28x = 350,916.66
  5. Step 5: Solve for x
    x = 350,916.66/746.28
  6. Step 6: Final answer
    x = 470.22

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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.