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Finding the Fourth Proportional to 320.16, 441.36 and 261.84

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Solution

The fourth proportional to 320.16, 441.36 and 261.84 is: 360.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.16 : 441.36 = 261.84 : x
  2. Step 2: Convert to fraction form
    320.16/441.36 = 261.84/x
  3. Step 3: Cross multiply
    320.16x = 441.36 × 261.84
  4. Step 4: Simplify right side
    320.16x = 115,565.70
  5. Step 5: Solve for x
    x = 115,565.70/320.16
  6. Step 6: Final answer
    x = 360.96

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.