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Finding the Fourth Proportional to 818.68, 1,228.62 and 636.52

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Solution

The fourth proportional to 818.68, 1,228.62 and 636.52 is: 955.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.68 : 1,228.62 = 636.52 : x
  2. Step 2: Convert to fraction form
    818.68/1,228.62 = 636.52/x
  3. Step 3: Cross multiply
    818.68x = 1,228.62 × 636.52
  4. Step 4: Simplify right side
    818.68x = 782,041.20
  5. Step 5: Solve for x
    x = 782,041.20/818.68
  6. Step 6: Final answer
    x = 955.25

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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.