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Finding the Fourth Proportional to 548.21, 756.60 and 315.34

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Solution

The fourth proportional to 548.21, 756.60 and 315.34 is: 435.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    548.21 : 756.60 = 315.34 : x
  2. Step 2: Convert to fraction form
    548.21/756.60 = 315.34/x
  3. Step 3: Cross multiply
    548.21x = 756.60 × 315.34
  4. Step 4: Simplify right side
    548.21x = 238,582.46
  5. Step 5: Solve for x
    x = 238,582.46/548.21
  6. Step 6: Final answer
    x = 435.20

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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.