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Finding the Fourth Proportional to 157.75, 217.79 and 105.40

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Solution

The fourth proportional to 157.75, 217.79 and 105.40 is: 145.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.75 : 217.79 = 105.40 : x
  2. Step 2: Convert to fraction form
    157.75/217.79 = 105.40/x
  3. Step 3: Cross multiply
    157.75x = 217.79 × 105.40
  4. Step 4: Simplify right side
    157.75x = 22,955.21
  5. Step 5: Solve for x
    x = 22,955.21/157.75
  6. Step 6: Final answer
    x = 145.52

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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.