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Finding the Fourth Proportional to 829.92, 1,142.54 and 640.38

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Solution

The fourth proportional to 829.92, 1,142.54 and 640.38 is: 881.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    829.92 : 1,142.54 = 640.38 : x
  2. Step 2: Convert to fraction form
    829.92/1,142.54 = 640.38/x
  3. Step 3: Cross multiply
    829.92x = 1,142.54 × 640.38
  4. Step 4: Simplify right side
    829.92x = 731,659.77
  5. Step 5: Solve for x
    x = 731,659.77/829.92
  6. Step 6: Final answer
    x = 881.60

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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.