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Finding the Fourth Proportional to 548.70, 757.06 and 312.60

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Solution

The fourth proportional to 548.70, 757.06 and 312.60 is: 431.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    548.70 : 757.06 = 312.60 : x
  2. Step 2: Convert to fraction form
    548.70/757.06 = 312.60/x
  3. Step 3: Cross multiply
    548.70x = 757.06 × 312.60
  4. Step 4: Simplify right side
    548.70x = 236,656.96
  5. Step 5: Solve for x
    x = 236,656.96/548.70
  6. Step 6: Final answer
    x = 431.30

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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.