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Finding the Fourth Proportional to 901.31, 1,351.81 and 640.52

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Solution

The fourth proportional to 901.31, 1,351.81 and 640.52 is: 960.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    901.31 : 1,351.81 = 640.52 : x
  2. Step 2: Convert to fraction form
    901.31/1,351.81 = 640.52/x
  3. Step 3: Cross multiply
    901.31x = 1,351.81 × 640.52
  4. Step 4: Simplify right side
    901.31x = 865,861.34
  5. Step 5: Solve for x
    x = 865,861.34/901.31
  6. Step 6: Final answer
    x = 960.67

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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.