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Finding the Fourth Proportional to 105.72, 157.78 and 98.58

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Solution

The fourth proportional to 105.72, 157.78 and 98.58 is: 147.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.72 : 157.78 = 98.58 : x
  2. Step 2: Convert to fraction form
    105.72/157.78 = 98.58/x
  3. Step 3: Cross multiply
    105.72x = 157.78 × 98.58
  4. Step 4: Simplify right side
    105.72x = 15,553.95
  5. Step 5: Solve for x
    x = 15,553.95/105.72
  6. Step 6: Final answer
    x = 147.12

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.