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Finding the Fourth Proportional to 157.80, 217.68 and 139.38

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Solution

The fourth proportional to 157.80, 217.68 and 139.38 is: 192.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.80 : 217.68 = 139.38 : x
  2. Step 2: Convert to fraction form
    157.80/217.68 = 139.38/x
  3. Step 3: Cross multiply
    157.80x = 217.68 × 139.38
  4. Step 4: Simplify right side
    157.80x = 30,340.24
  5. Step 5: Solve for x
    x = 30,340.24/157.80
  6. Step 6: Final answer
    x = 192.27

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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.