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Finding the Fourth Proportional to 320.40, 480.56 and 114.95

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Solution

The fourth proportional to 320.40, 480.56 and 114.95 is: 172.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.40 : 480.56 = 114.95 : x
  2. Step 2: Convert to fraction form
    320.40/480.56 = 114.95/x
  3. Step 3: Cross multiply
    320.40x = 480.56 × 114.95
  4. Step 4: Simplify right side
    320.40x = 55,240.37
  5. Step 5: Solve for x
    x = 55,240.37/320.40
  6. Step 6: Final answer
    x = 172.41

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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.