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Finding the Fourth Proportional to 818.30, 1,129.67 and 631.37

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Solution

The fourth proportional to 818.30, 1,129.67 and 631.37 is: 871.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.30 : 1,129.67 = 631.37 : x
  2. Step 2: Convert to fraction form
    818.30/1,129.67 = 631.37/x
  3. Step 3: Cross multiply
    818.30x = 1,129.67 × 631.37
  4. Step 4: Simplify right side
    818.30x = 713,230.94
  5. Step 5: Solve for x
    x = 713,230.94/818.30
  6. Step 6: Final answer
    x = 871.61

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1.5x scale

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.