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Finding the Fourth Proportional to 423.18, 585.36 and 330.84

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Solution

The fourth proportional to 423.18, 585.36 and 330.84 is: 457.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    423.18 : 585.36 = 330.84 : x
  2. Step 2: Convert to fraction form
    423.18/585.36 = 330.84/x
  3. Step 3: Cross multiply
    423.18x = 585.36 × 330.84
  4. Step 4: Simplify right side
    423.18x = 193,660.50
  5. Step 5: Solve for x
    x = 193,660.50/423.18
  6. Step 6: Final answer
    x = 457.63

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.