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Finding the Fourth Proportional to 156.63, 216.23 and 121.67

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Solution

The fourth proportional to 156.63, 216.23 and 121.67 is: 167.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.63 : 216.23 = 121.67 : x
  2. Step 2: Convert to fraction form
    156.63/216.23 = 121.67/x
  3. Step 3: Cross multiply
    156.63x = 216.23 × 121.67
  4. Step 4: Simplify right side
    156.63x = 26,307.01
  5. Step 5: Solve for x
    x = 26,307.01/156.63
  6. Step 6: Final answer
    x = 167.96

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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.