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Finding the Fourth Proportional to 742.02, 1,112.49 and 640.50

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Solution

The fourth proportional to 742.02, 1,112.49 and 640.50 is: 960.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    742.02 : 1,112.49 = 640.50 : x
  2. Step 2: Convert to fraction form
    742.02/1,112.49 = 640.50/x
  3. Step 3: Cross multiply
    742.02x = 1,112.49 × 640.50
  4. Step 4: Simplify right side
    742.02x = 712,549.85
  5. Step 5: Solve for x
    x = 712,549.85/742.02
  6. Step 6: Final answer
    x = 960.28

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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.