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Finding the Fourth Proportional to 468.96, 647.19 and 311.31

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Solution

The fourth proportional to 468.96, 647.19 and 311.31 is: 429.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    468.96 : 647.19 = 311.31 : x
  2. Step 2: Convert to fraction form
    468.96/647.19 = 311.31/x
  3. Step 3: Cross multiply
    468.96x = 647.19 × 311.31
  4. Step 4: Simplify right side
    468.96x = 201,476.72
  5. Step 5: Solve for x
    x = 201,476.72/468.96
  6. Step 6: Final answer
    x = 429.63

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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.