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Finding the Fourth Proportional to 901.63, 1,350.90 and 640.34

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Solution

The fourth proportional to 901.63, 1,350.90 and 640.34 is: 959.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    901.63 : 1,350.90 = 640.34 : x
  2. Step 2: Convert to fraction form
    901.63/1,350.90 = 640.34/x
  3. Step 3: Cross multiply
    901.63x = 1,350.90 × 640.34
  4. Step 4: Simplify right side
    901.63x = 865,028.55
  5. Step 5: Solve for x
    x = 865,028.55/901.63
  6. Step 6: Final answer
    x = 959.41

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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.