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Finding the Fourth Proportional to 961.49, 1,441.76 and 345.11

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Solution

The fourth proportional to 961.49, 1,441.76 and 345.11 is: 517.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    961.49 : 1,441.76 = 345.11 : x
  2. Step 2: Convert to fraction form
    961.49/1,441.76 = 345.11/x
  3. Step 3: Cross multiply
    961.49x = 1,441.76 × 345.11
  4. Step 4: Simplify right side
    961.49x = 497,556.86
  5. Step 5: Solve for x
    x = 497,556.86/961.49
  6. Step 6: Final answer
    x = 517.48

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Double scale
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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.