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Finding the Fourth Proportional to 157.68, 217.50 and 105.12

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Solution

The fourth proportional to 157.68, 217.50 and 105.12 is: 145

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.68 : 217.50 = 105.12 : x
  2. Step 2: Convert to fraction form
    157.68/217.50 = 105.12/x
  3. Step 3: Cross multiply
    157.68x = 217.50 × 105.12
  4. Step 4: Simplify right side
    157.68x = 22,863.60
  5. Step 5: Solve for x
    x = 22,863.60/157.68
  6. Step 6: Final answer
    x = 145

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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.