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Finding the Fourth Proportional to 640.56, 961.08 and 384

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Solution

The fourth proportional to 640.56, 961.08 and 384 is: 576.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.56 : 961.08 = 384 : x
  2. Step 2: Convert to fraction form
    640.56/961.08 = 384/x
  3. Step 3: Cross multiply
    640.56x = 961.08 × 384
  4. Step 4: Simplify right side
    640.56x = 369,054.72
  5. Step 5: Solve for x
    x = 369,054.72/640.56
  6. Step 6: Final answer
    x = 576.14

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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.