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Finding the Fourth Proportional to 387.42, 579.72 and 333.96

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Solution

The fourth proportional to 387.42, 579.72 and 333.96 is: 499.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.42 : 579.72 = 333.96 : x
  2. Step 2: Convert to fraction form
    387.42/579.72 = 333.96/x
  3. Step 3: Cross multiply
    387.42x = 579.72 × 333.96
  4. Step 4: Simplify right side
    387.42x = 193,603.29
  5. Step 5: Solve for x
    x = 193,603.29/387.42
  6. Step 6: Final answer
    x = 499.72

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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.