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Finding the Fourth Proportional to 756.60, 1,043.46 and 631.92

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Solution

The fourth proportional to 756.60, 1,043.46 and 631.92 is: 871.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    756.60 : 1,043.46 = 631.92 : x
  2. Step 2: Convert to fraction form
    756.60/1,043.46 = 631.92/x
  3. Step 3: Cross multiply
    756.60x = 1,043.46 × 631.92
  4. Step 4: Simplify right side
    756.60x = 659,383.24
  5. Step 5: Solve for x
    x = 659,383.24/756.60
  6. Step 6: Final answer
    x = 871.51

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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.