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Finding the Fourth Proportional to 548.51, 756.74 and 312.42

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Solution

The fourth proportional to 548.51, 756.74 and 312.42 is: 431.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    548.51 : 756.74 = 312.42 : x
  2. Step 2: Convert to fraction form
    548.51/756.74 = 312.42/x
  3. Step 3: Cross multiply
    548.51x = 756.74 × 312.42
  4. Step 4: Simplify right side
    548.51x = 236,421.49
  5. Step 5: Solve for x
    x = 236,421.49/548.51
  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.