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Finding the Fourth Proportional to 321.34, 478.28 and 308.02

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Solution

The fourth proportional to 321.34, 478.28 and 308.02 is: 458.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.34 : 478.28 = 308.02 : x
  2. Step 2: Convert to fraction form
    321.34/478.28 = 308.02/x
  3. Step 3: Cross multiply
    321.34x = 478.28 × 308.02
  4. Step 4: Simplify right side
    321.34x = 147,319.81
  5. Step 5: Solve for x
    x = 147,319.81/321.34
  6. Step 6: Final answer
    x = 458.45

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.