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Finding the Fourth Proportional to 756.60, 1,043.10 and 639.96

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Solution

The fourth proportional to 756.60, 1,043.10 and 639.96 is: 882.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    756.60 : 1,043.10 = 639.96 : x
  2. Step 2: Convert to fraction form
    756.60/1,043.10 = 639.96/x
  3. Step 3: Cross multiply
    756.60x = 1,043.10 × 639.96
  4. Step 4: Simplify right side
    756.60x = 667,542.28
  5. Step 5: Solve for x
    x = 667,542.28/756.60
  6. Step 6: Final answer
    x = 882.29

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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.