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Finding the Fourth Proportional to 156.70, 216.07 and 121.67

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Solution

The fourth proportional to 156.70, 216.07 and 121.67 is: 167.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.70 : 216.07 = 121.67 : x
  2. Step 2: Convert to fraction form
    156.70/216.07 = 121.67/x
  3. Step 3: Cross multiply
    156.70x = 216.07 × 121.67
  4. Step 4: Simplify right side
    156.70x = 26,289.24
  5. Step 5: Solve for x
    x = 26,289.24/156.70
  6. Step 6: Final answer
    x = 167.77

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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.