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Finding the Fourth Proportional to 242.92, 335.20 and 155.50

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Solution

The fourth proportional to 242.92, 335.20 and 155.50 is: 214.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    242.92 : 335.20 = 155.50 : x
  2. Step 2: Convert to fraction form
    242.92/335.20 = 155.50/x
  3. Step 3: Cross multiply
    242.92x = 335.20 × 155.50
  4. Step 4: Simplify right side
    242.92x = 52,123.60
  5. Step 5: Solve for x
    x = 52,123.60/242.92
  6. Step 6: Final answer
    x = 214.57

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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.