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Finding the Fourth Proportional to 320.18, 480.87 and 259.43

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Solution

The fourth proportional to 320.18, 480.87 and 259.43 is: 389.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.18 : 480.87 = 259.43 : x
  2. Step 2: Convert to fraction form
    320.18/480.87 = 259.43/x
  3. Step 3: Cross multiply
    320.18x = 480.87 × 259.43
  4. Step 4: Simplify right side
    320.18x = 124,749.70
  5. Step 5: Solve for x
    x = 124,749.70/320.18
  6. Step 6: Final answer
    x = 389.63

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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.