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Finding the Fourth Proportional to 321.76, 482.76 and 148.48

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Solution

The fourth proportional to 321.76, 482.76 and 148.48 is: 222.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.76 : 482.76 = 148.48 : x
  2. Step 2: Convert to fraction form
    321.76/482.76 = 148.48/x
  3. Step 3: Cross multiply
    321.76x = 482.76 × 148.48
  4. Step 4: Simplify right side
    321.76x = 71,680.20
  5. Step 5: Solve for x
    x = 71,680.20/321.76
  6. Step 6: Final answer
    x = 222.78

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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.