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Finding the Fourth Proportional to 961.28, 1,442.61 and 345

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Solution

The fourth proportional to 961.28, 1,442.61 and 345 is: 517.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    961.28 : 1,442.61 = 345 : x
  2. Step 2: Convert to fraction form
    961.28/1,442.61 = 345/x
  3. Step 3: Cross multiply
    961.28x = 1,442.61 × 345
  4. Step 4: Simplify right side
    961.28x = 497,700.45
  5. Step 5: Solve for x
    x = 497,700.45/961.28
  6. Step 6: Final answer
    x = 517.75

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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.