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Finding the Fourth Proportional to 157.69, 236.53 and 138.67

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Solution

The fourth proportional to 157.69, 236.53 and 138.67 is: 208.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.69 : 236.53 = 138.67 : x
  2. Step 2: Convert to fraction form
    157.69/236.53 = 138.67/x
  3. Step 3: Cross multiply
    157.69x = 236.53 × 138.67
  4. Step 4: Simplify right side
    157.69x = 32,800.08
  5. Step 5: Solve for x
    x = 32,800.08/157.69
  6. Step 6: Final answer
    x = 208.01

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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.