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Finding the Fourth Proportional to 891.19, 1,336.89 and 306.30

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Solution

The fourth proportional to 891.19, 1,336.89 and 306.30 is: 459.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.19 : 1,336.89 = 306.30 : x
  2. Step 2: Convert to fraction form
    891.19/1,336.89 = 306.30/x
  3. Step 3: Cross multiply
    891.19x = 1,336.89 × 306.30
  4. Step 4: Simplify right side
    891.19x = 409,489.41
  5. Step 5: Solve for x
    x = 409,489.41/891.19
  6. Step 6: Final answer
    x = 459.49

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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.