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Finding the Fourth Proportional to 322.44, 444.54 and 312.72

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Solution

The fourth proportional to 322.44, 444.54 and 312.72 is: 431.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    322.44 : 444.54 = 312.72 : x
  2. Step 2: Convert to fraction form
    322.44/444.54 = 312.72/x
  3. Step 3: Cross multiply
    322.44x = 444.54 × 312.72
  4. Step 4: Simplify right side
    322.44x = 139,016.55
  5. Step 5: Solve for x
    x = 139,016.55/322.44
  6. Step 6: Final answer
    x = 431.14

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.