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Finding the Fourth Proportional to 214.76, 321.78 and 99.04

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Solution

The fourth proportional to 214.76, 321.78 and 99.04 is: 148.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    214.76 : 321.78 = 99.04 : x
  2. Step 2: Convert to fraction form
    214.76/321.78 = 99.04/x
  3. Step 3: Cross multiply
    214.76x = 321.78 × 99.04
  4. Step 4: Simplify right side
    214.76x = 31,867.48
  5. Step 5: Solve for x
    x = 31,867.48/214.76
  6. Step 6: Final answer
    x = 148.39

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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.