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Finding the Fourth Proportional to 105.17, 157.90 and 66.89

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Solution

The fourth proportional to 105.17, 157.90 and 66.89 is: 100.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.17 : 157.90 = 66.89 : x
  2. Step 2: Convert to fraction form
    105.17/157.90 = 66.89/x
  3. Step 3: Cross multiply
    105.17x = 157.90 × 66.89
  4. Step 4: Simplify right side
    105.17x = 10,561.93
  5. Step 5: Solve for x
    x = 10,561.93/105.17
  6. Step 6: Final answer
    x = 100.43

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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.