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Finding the Fourth Proportional to 320.16, 439 and 288.96

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Solution

The fourth proportional to 320.16, 439 and 288.96 is: 396.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.16 : 439 = 288.96 : x
  2. Step 2: Convert to fraction form
    320.16/439 = 288.96/x
  3. Step 3: Cross multiply
    320.16x = 439 × 288.96
  4. Step 4: Simplify right side
    320.16x = 126,853.44
  5. Step 5: Solve for x
    x = 126,853.44/320.16
  6. Step 6: Final answer
    x = 396.22

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.