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Finding the Fourth Proportional to 330.48, 458.64 and 317.28

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Solution

The fourth proportional to 330.48, 458.64 and 317.28 is: 440.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    330.48 : 458.64 = 317.28 : x
  2. Step 2: Convert to fraction form
    330.48/458.64 = 317.28/x
  3. Step 3: Cross multiply
    330.48x = 458.64 × 317.28
  4. Step 4: Simplify right side
    330.48x = 145,517.30
  5. Step 5: Solve for x
    x = 145,517.30/330.48
  6. Step 6: Final answer
    x = 440.32

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.