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Finding the Fourth Proportional to 336.84, 505.08 and 131.28

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Solution

The fourth proportional to 336.84, 505.08 and 131.28 is: 196.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    336.84 : 505.08 = 131.28 : x
  2. Step 2: Convert to fraction form
    336.84/505.08 = 131.28/x
  3. Step 3: Cross multiply
    336.84x = 505.08 × 131.28
  4. Step 4: Simplify right side
    336.84x = 66,306.90
  5. Step 5: Solve for x
    x = 66,306.90/336.84
  6. Step 6: Final answer
    x = 196.85

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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.