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Finding the Fourth Proportional to 548.32, 821.42 and 432.15

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Solution

The fourth proportional to 548.32, 821.42 and 432.15 is: 647.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    548.32 : 821.42 = 432.15 : x
  2. Step 2: Convert to fraction form
    548.32/821.42 = 432.15/x
  3. Step 3: Cross multiply
    548.32x = 821.42 × 432.15
  4. Step 4: Simplify right side
    548.32x = 354,976.65
  5. Step 5: Solve for x
    x = 354,976.65/548.32
  6. Step 6: Final answer
    x = 647.39

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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.