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Finding the Fourth Proportional to 329.16, 493.75 and 85.69

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Solution

The fourth proportional to 329.16, 493.75 and 85.69 is: 128.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    329.16 : 493.75 = 85.69 : x
  2. Step 2: Convert to fraction form
    329.16/493.75 = 85.69/x
  3. Step 3: Cross multiply
    329.16x = 493.75 × 85.69
  4. Step 4: Simplify right side
    329.16x = 42,309.68
  5. Step 5: Solve for x
    x = 42,309.68/329.16
  6. Step 6: Final answer
    x = 128.54

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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.