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Finding the Fourth Proportional to 641.39, 961.67 and 230.51

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Solution

The fourth proportional to 641.39, 961.67 and 230.51 is: 345.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.39 : 961.67 = 230.51 : x
  2. Step 2: Convert to fraction form
    641.39/961.67 = 230.51/x
  3. Step 3: Cross multiply
    641.39x = 961.67 × 230.51
  4. Step 4: Simplify right side
    641.39x = 221,677.53
  5. Step 5: Solve for x
    x = 221,677.53/641.39
  6. Step 6: Final answer
    x = 345.62

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Double scale
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Similar ratio
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1.5x scale

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.