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Finding the Fourth Proportional to 961.79, 1,442.87 and 312.57

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Solution

The fourth proportional to 961.79, 1,442.87 and 312.57 is: 468.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    961.79 : 1,442.87 = 312.57 : x
  2. Step 2: Convert to fraction form
    961.79/1,442.87 = 312.57/x
  3. Step 3: Cross multiply
    961.79x = 1,442.87 × 312.57
  4. Step 4: Simplify right side
    961.79x = 450,998.66
  5. Step 5: Solve for x
    x = 450,998.66/961.79
  6. Step 6: Final answer
    x = 468.92

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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.