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Finding the Fourth Proportional to 640.12, 958.38 and 465.64

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Solution

The fourth proportional to 640.12, 958.38 and 465.64 is: 697.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.12 : 958.38 = 465.64 : x
  2. Step 2: Convert to fraction form
    640.12/958.38 = 465.64/x
  3. Step 3: Cross multiply
    640.12x = 958.38 × 465.64
  4. Step 4: Simplify right side
    640.12x = 446,260.06
  5. Step 5: Solve for x
    x = 446,260.06/640.12
  6. Step 6: Final answer
    x = 697.15

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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.