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Finding the Fourth Proportional to 214.93, 321.95 and 99.21

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Solution

The fourth proportional to 214.93, 321.95 and 99.21 is: 148.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    214.93 : 321.95 = 99.21 : x
  2. Step 2: Convert to fraction form
    214.93/321.95 = 99.21/x
  3. Step 3: Cross multiply
    214.93x = 321.95 × 99.21
  4. Step 4: Simplify right side
    214.93x = 31,941.03
  5. Step 5: Solve for x
    x = 31,941.03/214.93
  6. Step 6: Final answer
    x = 148.61

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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.