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Finding the Fourth Proportional to 214.80, 321.75 and 111.93

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Solution

The fourth proportional to 214.80, 321.75 and 111.93 is: 167.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    214.80 : 321.75 = 111.93 : x
  2. Step 2: Convert to fraction form
    214.80/321.75 = 111.93/x
  3. Step 3: Cross multiply
    214.80x = 321.75 × 111.93
  4. Step 4: Simplify right side
    214.80x = 36,013.48
  5. Step 5: Solve for x
    x = 36,013.48/214.80
  6. Step 6: Final answer
    x = 167.66

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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.