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Finding the Fourth Proportional to 548.21, 756.43 and 315.29

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Solution

The fourth proportional to 548.21, 756.43 and 315.29 is: 435.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    548.21 : 756.43 = 315.29 : x
  2. Step 2: Convert to fraction form
    548.21/756.43 = 315.29/x
  3. Step 3: Cross multiply
    548.21x = 756.43 × 315.29
  4. Step 4: Simplify right side
    548.21x = 238,490.24
  5. Step 5: Solve for x
    x = 238,490.24/548.21
  6. Step 6: Final answer
    x = 435.04

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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.