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Finding the Fourth Proportional to 641.40, 961.99 and 230.46

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Solution

The fourth proportional to 641.40, 961.99 and 230.46 is: 345.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.40 : 961.99 = 230.46 : x
  2. Step 2: Convert to fraction form
    641.40/961.99 = 230.46/x
  3. Step 3: Cross multiply
    641.40x = 961.99 × 230.46
  4. Step 4: Simplify right side
    641.40x = 221,694.83
  5. Step 5: Solve for x
    x = 221,694.83/641.40
  6. Step 6: Final answer
    x = 345.64

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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.