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Finding the Fourth Proportional to 641.60, 961.76 and 230.40

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Solution

The fourth proportional to 641.60, 961.76 and 230.40 is: 345.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.60 : 961.76 = 230.40 : x
  2. Step 2: Convert to fraction form
    641.60/961.76 = 230.40/x
  3. Step 3: Cross multiply
    641.60x = 961.76 × 230.40
  4. Step 4: Simplify right side
    641.60x = 221,589.50
  5. Step 5: Solve for x
    x = 221,589.50/641.60
  6. Step 6: Final answer
    x = 345.37

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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.