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Finding the Fourth Proportional to 548.12, 820.89 and 287.51

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Solution

The fourth proportional to 548.12, 820.89 and 287.51 is: 430.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    548.12 : 820.89 = 287.51 : x
  2. Step 2: Convert to fraction form
    548.12/820.89 = 287.51/x
  3. Step 3: Cross multiply
    548.12x = 820.89 × 287.51
  4. Step 4: Simplify right side
    548.12x = 236,009.98
  5. Step 5: Solve for x
    x = 236,009.98/548.12
  6. Step 6: Final answer
    x = 430.58

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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.