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Finding the Fourth Proportional to 330.63, 495.96 and 87.15

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Solution

The fourth proportional to 330.63, 495.96 and 87.15 is: 130.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    330.63 : 495.96 = 87.15 : x
  2. Step 2: Convert to fraction form
    330.63/495.96 = 87.15/x
  3. Step 3: Cross multiply
    330.63x = 495.96 × 87.15
  4. Step 4: Simplify right side
    330.63x = 43,222.91
  5. Step 5: Solve for x
    x = 43,222.91/330.63
  6. Step 6: Final answer
    x = 130.73

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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.