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Finding the Fourth Proportional to 548.45, 821.32 and 288.66

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Solution

The fourth proportional to 548.45, 821.32 and 288.66 is: 432.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    548.45 : 821.32 = 288.66 : x
  2. Step 2: Convert to fraction form
    548.45/821.32 = 288.66/x
  3. Step 3: Cross multiply
    548.45x = 821.32 × 288.66
  4. Step 4: Simplify right side
    548.45x = 237,081.51
  5. Step 5: Solve for x
    x = 237,081.51/548.45
  6. Step 6: Final answer
    x = 432.28

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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.