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Finding the Fourth Proportional to 157.76, 236.70 and 139.86

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Solution

The fourth proportional to 157.76, 236.70 and 139.86 is: 209.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.76 : 236.70 = 139.86 : x
  2. Step 2: Convert to fraction form
    157.76/236.70 = 139.86/x
  3. Step 3: Cross multiply
    157.76x = 236.70 × 139.86
  4. Step 4: Simplify right side
    157.76x = 33,104.86
  5. Step 5: Solve for x
    x = 33,104.86/157.76
  6. Step 6: Final answer
    x = 209.84

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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.