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Finding the Fourth Proportional to 818.86, 1,228.50 and 672.85

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Solution

The fourth proportional to 818.86, 1,228.50 and 672.85 is: 1,009.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.86 : 1,228.50 = 672.85 : x
  2. Step 2: Convert to fraction form
    818.86/1,228.50 = 672.85/x
  3. Step 3: Cross multiply
    818.86x = 1,228.50 × 672.85
  4. Step 4: Simplify right side
    818.86x = 826,596.23
  5. Step 5: Solve for x
    x = 826,596.23/818.86
  6. Step 6: Final answer
    x = 1,009.45

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.