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Finding the Fourth Proportional to 641.05, 961.56 and 230.21

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Solution

The fourth proportional to 641.05, 961.56 and 230.21 is: 345.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.05 : 961.56 = 230.21 : x
  2. Step 2: Convert to fraction form
    641.05/961.56 = 230.21/x
  3. Step 3: Cross multiply
    641.05x = 961.56 × 230.21
  4. Step 4: Simplify right side
    641.05x = 221,359.58
  5. Step 5: Solve for x
    x = 221,359.58/641.05
  6. Step 6: Final answer
    x = 345.31

Related Problems

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Half scale
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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.