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Finding the Fourth Proportional to 427.54, 641.28 and 253.67

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Solution

The fourth proportional to 427.54, 641.28 and 253.67 is: 380.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.54 : 641.28 = 253.67 : x
  2. Step 2: Convert to fraction form
    427.54/641.28 = 253.67/x
  3. Step 3: Cross multiply
    427.54x = 641.28 × 253.67
  4. Step 4: Simplify right side
    427.54x = 162,671.24
  5. Step 5: Solve for x
    x = 162,671.24/427.54
  6. Step 6: Final answer
    x = 380.48

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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.