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Finding the Fourth Proportional to 111.98, 154.50 and 102.40

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Solution

The fourth proportional to 111.98, 154.50 and 102.40 is: 141.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.98 : 154.50 = 102.40 : x
  2. Step 2: Convert to fraction form
    111.98/154.50 = 102.40/x
  3. Step 3: Cross multiply
    111.98x = 154.50 × 102.40
  4. Step 4: Simplify right side
    111.98x = 15,820.03
  5. Step 5: Solve for x
    x = 15,820.03/111.98
  6. Step 6: Final answer
    x = 141.28

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.