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Finding the Fourth Proportional to 641.18, 961.61 and 230.30

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Solution

The fourth proportional to 641.18, 961.61 and 230.30 is: 345.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.18 : 961.61 = 230.30 : x
  2. Step 2: Convert to fraction form
    641.18/961.61 = 230.30/x
  3. Step 3: Cross multiply
    641.18x = 961.61 × 230.30
  4. Step 4: Simplify right side
    641.18x = 221,452.82
  5. Step 5: Solve for x
    x = 221,452.82/641.18
  6. Step 6: Final answer
    x = 345.39

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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.