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Finding the Fourth Proportional to 157.66, 236.13 and 121.30

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Solution

The fourth proportional to 157.66, 236.13 and 121.30 is: 181.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.66 : 236.13 = 121.30 : x
  2. Step 2: Convert to fraction form
    157.66/236.13 = 121.30/x
  3. Step 3: Cross multiply
    157.66x = 236.13 × 121.30
  4. Step 4: Simplify right side
    157.66x = 28,642.57
  5. Step 5: Solve for x
    x = 28,642.57/157.66
  6. Step 6: Final answer
    x = 181.67

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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.