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Finding the Fourth Proportional to 329.16, 493.76 and 85.68

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Solution

The fourth proportional to 329.16, 493.76 and 85.68 is: 128.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    329.16 : 493.76 = 85.68 : x
  2. Step 2: Convert to fraction form
    329.16/493.76 = 85.68/x
  3. Step 3: Cross multiply
    329.16x = 493.76 × 85.68
  4. Step 4: Simplify right side
    329.16x = 42,305.09
  5. Step 5: Solve for x
    x = 42,305.09/329.16
  6. Step 6: Final answer
    x = 128.52

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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.