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Finding the Fourth Proportional to 905.74, 1,358.56 and 495.67

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Solution

The fourth proportional to 905.74, 1,358.56 and 495.67 is: 743.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.74 : 1,358.56 = 495.67 : x
  2. Step 2: Convert to fraction form
    905.74/1,358.56 = 495.67/x
  3. Step 3: Cross multiply
    905.74x = 1,358.56 × 495.67
  4. Step 4: Simplify right side
    905.74x = 673,399.59
  5. Step 5: Solve for x
    x = 673,399.59/905.74
  6. Step 6: Final answer
    x = 743.48

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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.