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Finding the Fourth Proportional to 464.31, 639.80 and 381.15

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Solution

The fourth proportional to 464.31, 639.80 and 381.15 is: 525.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    464.31 : 639.80 = 381.15 : x
  2. Step 2: Convert to fraction form
    464.31/639.80 = 381.15/x
  3. Step 3: Cross multiply
    464.31x = 639.80 × 381.15
  4. Step 4: Simplify right side
    464.31x = 243,857.86
  5. Step 5: Solve for x
    x = 243,857.86/464.31
  6. Step 6: Final answer
    x = 525.20

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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.