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Finding the Fourth Proportional to 961.91, 1,442.87 and 312.70

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Solution

The fourth proportional to 961.91, 1,442.87 and 312.70 is: 469.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    961.91 : 1,442.87 = 312.70 : x
  2. Step 2: Convert to fraction form
    961.91/1,442.87 = 312.70/x
  3. Step 3: Cross multiply
    961.91x = 1,442.87 × 312.70
  4. Step 4: Simplify right side
    961.91x = 451,176.67
  5. Step 5: Solve for x
    x = 451,176.67/961.91
  6. Step 6: Final answer
    x = 469.04

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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.