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Finding the Fourth Proportional to 548.37, 821.48 and 393.93

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Solution

The fourth proportional to 548.37, 821.48 and 393.93 is: 590.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    548.37 : 821.48 = 393.93 : x
  2. Step 2: Convert to fraction form
    548.37/821.48 = 393.93/x
  3. Step 3: Cross multiply
    548.37x = 821.48 × 393.93
  4. Step 4: Simplify right side
    548.37x = 323,603.65
  5. Step 5: Solve for x
    x = 323,603.65/548.37
  6. Step 6: Final answer
    x = 590.12

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.