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Finding the Fourth Proportional to 320.68, 481.06 and 147.40

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Solution

The fourth proportional to 320.68, 481.06 and 147.40 is: 221.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.68 : 481.06 = 147.40 : x
  2. Step 2: Convert to fraction form
    320.68/481.06 = 147.40/x
  3. Step 3: Cross multiply
    320.68x = 481.06 × 147.40
  4. Step 4: Simplify right side
    320.68x = 70,908.24
  5. Step 5: Solve for x
    x = 70,908.24/320.68
  6. Step 6: Final answer
    x = 221.12

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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.