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Finding the Fourth Proportional to 320.98, 480.79 and 147.79

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Solution

The fourth proportional to 320.98, 480.79 and 147.79 is: 221.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.98 : 480.79 = 147.79 : x
  2. Step 2: Convert to fraction form
    320.98/480.79 = 147.79/x
  3. Step 3: Cross multiply
    320.98x = 480.79 × 147.79
  4. Step 4: Simplify right side
    320.98x = 71,055.95
  5. Step 5: Solve for x
    x = 71,055.95/320.98
  6. Step 6: Final answer
    x = 221.37

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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.