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Finding the Fourth Proportional to 330.94, 495.53 and 253.72

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Solution

The fourth proportional to 330.94, 495.53 and 253.72 is: 379.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    330.94 : 495.53 = 253.72 : x
  2. Step 2: Convert to fraction form
    330.94/495.53 = 253.72/x
  3. Step 3: Cross multiply
    330.94x = 495.53 × 253.72
  4. Step 4: Simplify right side
    330.94x = 125,725.87
  5. Step 5: Solve for x
    x = 125,725.87/330.94
  6. Step 6: Final answer
    x = 379.91

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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.