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Finding the Fourth Proportional to 818.66, 1,128.97 and 631.85

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Solution

The fourth proportional to 818.66, 1,128.97 and 631.85 is: 871.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.66 : 1,128.97 = 631.85 : x
  2. Step 2: Convert to fraction form
    818.66/1,128.97 = 631.85/x
  3. Step 3: Cross multiply
    818.66x = 1,128.97 × 631.85
  4. Step 4: Simplify right side
    818.66x = 713,340.94
  5. Step 5: Solve for x
    x = 713,340.94/818.66
  6. Step 6: Final answer
    x = 871.35

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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.