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Finding the Fourth Proportional to 161.53, 242.09 and 156.86

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Solution

The fourth proportional to 161.53, 242.09 and 156.86 is: 235.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.53 : 242.09 = 156.86 : x
  2. Step 2: Convert to fraction form
    161.53/242.09 = 156.86/x
  3. Step 3: Cross multiply
    161.53x = 242.09 × 156.86
  4. Step 4: Simplify right side
    161.53x = 37,973.45
  5. Step 5: Solve for x
    x = 37,973.45/161.53
  6. Step 6: Final answer
    x = 235.09

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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.