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Finding the Fourth Proportional to 902.94, 1,245.54 and 640.50

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Solution

The fourth proportional to 902.94, 1,245.54 and 640.50 is: 883.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    902.94 : 1,245.54 = 640.50 : x
  2. Step 2: Convert to fraction form
    902.94/1,245.54 = 640.50/x
  3. Step 3: Cross multiply
    902.94x = 1,245.54 × 640.50
  4. Step 4: Simplify right side
    902.94x = 797,768.37
  5. Step 5: Solve for x
    x = 797,768.37/902.94
  6. Step 6: Final answer
    x = 883.52

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.