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Finding the Fourth Proportional to 431.98, 648.03 and 143.35

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Solution

The fourth proportional to 431.98, 648.03 and 143.35 is: 215.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    431.98 : 648.03 = 143.35 : x
  2. Step 2: Convert to fraction form
    431.98/648.03 = 143.35/x
  3. Step 3: Cross multiply
    431.98x = 648.03 × 143.35
  4. Step 4: Simplify right side
    431.98x = 92,891.86
  5. Step 5: Solve for x
    x = 92,891.86/431.98
  6. Step 6: Final answer
    x = 215.04

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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.