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Finding the Fourth Proportional to 639.12, 956.88 and 464.64

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Solution

The fourth proportional to 639.12, 956.88 and 464.64 is: 695.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.12 : 956.88 = 464.64 : x
  2. Step 2: Convert to fraction form
    639.12/956.88 = 464.64/x
  3. Step 3: Cross multiply
    639.12x = 956.88 × 464.64
  4. Step 4: Simplify right side
    639.12x = 444,604.72
  5. Step 5: Solve for x
    x = 444,604.72/639.12
  6. Step 6: Final answer
    x = 695.65

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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.