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Finding the Fourth Proportional to 985.26, 1,359.89 and 631.50

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Solution

The fourth proportional to 985.26, 1,359.89 and 631.50 is: 871.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.26 : 1,359.89 = 631.50 : x
  2. Step 2: Convert to fraction form
    985.26/1,359.89 = 631.50/x
  3. Step 3: Cross multiply
    985.26x = 1,359.89 × 631.50
  4. Step 4: Simplify right side
    985.26x = 858,764.65
  5. Step 5: Solve for x
    x = 858,764.65/985.26
  6. Step 6: Final answer
    x = 871.61

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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.