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Finding the Fourth Proportional to 640.93, 961.43 and 178.71

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Solution

The fourth proportional to 640.93, 961.43 and 178.71 is: 268.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.93 : 961.43 = 178.71 : x
  2. Step 2: Convert to fraction form
    640.93/961.43 = 178.71/x
  3. Step 3: Cross multiply
    640.93x = 961.43 × 178.71
  4. Step 4: Simplify right side
    640.93x = 171,817.16
  5. Step 5: Solve for x
    x = 171,817.16/640.93
  6. Step 6: Final answer
    x = 268.07

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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.