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Finding the Fourth Proportional to 756.18, 1,043.01 and 631.85

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Solution

The fourth proportional to 756.18, 1,043.01 and 631.85 is: 871.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    756.18 : 1,043.01 = 631.85 : x
  2. Step 2: Convert to fraction form
    756.18/1,043.01 = 631.85/x
  3. Step 3: Cross multiply
    756.18x = 1,043.01 × 631.85
  4. Step 4: Simplify right side
    756.18x = 659,020.65
  5. Step 5: Solve for x
    x = 659,020.65/756.18
  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.