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Finding the Fourth Proportional to 961.72, 1,442.90 and 312.48

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Solution

The fourth proportional to 961.72, 1,442.90 and 312.48 is: 468.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    961.72 : 1,442.90 = 312.48 : x
  2. Step 2: Convert to fraction form
    961.72/1,442.90 = 312.48/x
  3. Step 3: Cross multiply
    961.72x = 1,442.90 × 312.48
  4. Step 4: Simplify right side
    961.72x = 450,877.39
  5. Step 5: Solve for x
    x = 450,877.39/961.72
  6. Step 6: Final answer
    x = 468.82

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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.