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Finding the Fourth Proportional to 320.28, 476.64 and 308.76

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Solution

The fourth proportional to 320.28, 476.64 and 308.76 is: 459.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.28 : 476.64 = 308.76 : x
  2. Step 2: Convert to fraction form
    320.28/476.64 = 308.76/x
  3. Step 3: Cross multiply
    320.28x = 476.64 × 308.76
  4. Step 4: Simplify right side
    320.28x = 147,167.37
  5. Step 5: Solve for x
    x = 147,167.37/320.28
  6. Step 6: Final answer
    x = 459.50

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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.