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Finding the Fourth Proportional to 891.36, 1,337.20 and 306.43

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Solution

The fourth proportional to 891.36, 1,337.20 and 306.43 is: 459.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.36 : 1,337.20 = 306.43 : x
  2. Step 2: Convert to fraction form
    891.36/1,337.20 = 306.43/x
  3. Step 3: Cross multiply
    891.36x = 1,337.20 × 306.43
  4. Step 4: Simplify right side
    891.36x = 409,754.09
  5. Step 5: Solve for x
    x = 409,754.09/891.36
  6. Step 6: Final answer
    x = 459.70

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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.