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Finding the Fourth Proportional to 961.47, 1,442.21 and 312.26

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Solution

The fourth proportional to 961.47, 1,442.21 and 312.26 is: 468.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    961.47 : 1,442.21 = 312.26 : x
  2. Step 2: Convert to fraction form
    961.47/1,442.21 = 312.26/x
  3. Step 3: Cross multiply
    961.47x = 1,442.21 × 312.26
  4. Step 4: Simplify right side
    961.47x = 450,335.72
  5. Step 5: Solve for x
    x = 450,335.72/961.47
  6. Step 6: Final answer
    x = 468.38

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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.