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Finding the Fourth Proportional to 818.32, 1,226.28 and 645.41

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Solution

The fourth proportional to 818.32, 1,226.28 and 645.41 is: 967.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.32 : 1,226.28 = 645.41 : x
  2. Step 2: Convert to fraction form
    818.32/1,226.28 = 645.41/x
  3. Step 3: Cross multiply
    818.32x = 1,226.28 × 645.41
  4. Step 4: Simplify right side
    818.32x = 791,453.37
  5. Step 5: Solve for x
    x = 791,453.37/818.32
  6. Step 6: Final answer
    x = 967.17

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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.