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Finding the Fourth Proportional to 548.20, 756.66 and 312.28

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Solution

The fourth proportional to 548.20, 756.66 and 312.28 is: 431.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    548.20 : 756.66 = 312.28 : x
  2. Step 2: Convert to fraction form
    548.20/756.66 = 312.28/x
  3. Step 3: Cross multiply
    548.20x = 756.66 × 312.28
  4. Step 4: Simplify right side
    548.20x = 236,288.22
  5. Step 5: Solve for x
    x = 236,288.22/548.20
  6. Step 6: Final answer
    x = 431.03

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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.