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Finding the Fourth Proportional to 155.56, 214.85 and 121.01

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Solution

The fourth proportional to 155.56, 214.85 and 121.01 is: 167.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.56 : 214.85 = 121.01 : x
  2. Step 2: Convert to fraction form
    155.56/214.85 = 121.01/x
  3. Step 3: Cross multiply
    155.56x = 214.85 × 121.01
  4. Step 4: Simplify right side
    155.56x = 25,997.55
  5. Step 5: Solve for x
    x = 25,997.55/155.56
  6. Step 6: Final answer
    x = 167.12

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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.