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Finding the Fourth Proportional to 101.98, 153.48 and 76.43

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Solution

The fourth proportional to 101.98, 153.48 and 76.43 is: 115.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    101.98 : 153.48 = 76.43 : x
  2. Step 2: Convert to fraction form
    101.98/153.48 = 76.43/x
  3. Step 3: Cross multiply
    101.98x = 153.48 × 76.43
  4. Step 4: Simplify right side
    101.98x = 11,730.48
  5. Step 5: Solve for x
    x = 11,730.48/101.98
  6. Step 6: Final answer
    x = 115.03

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.