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Finding the Fourth Proportional to 83.63, 125.39 and 42.98

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Solution

The fourth proportional to 83.63, 125.39 and 42.98 is: 64.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.63 : 125.39 = 42.98 : x
  2. Step 2: Convert to fraction form
    83.63/125.39 = 42.98/x
  3. Step 3: Cross multiply
    83.63x = 125.39 × 42.98
  4. Step 4: Simplify right side
    83.63x = 5,388.74
  5. Step 5: Solve for x
    x = 5,388.74/83.63
  6. Step 6: Final answer
    x = 64.43

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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.