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Finding the Fourth Proportional to 214.78, 322.53 and 191.68

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Solution

The fourth proportional to 214.78, 322.53 and 191.68 is: 287.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    214.78 : 322.53 = 191.68 : x
  2. Step 2: Convert to fraction form
    214.78/322.53 = 191.68/x
  3. Step 3: Cross multiply
    214.78x = 322.53 × 191.68
  4. Step 4: Simplify right side
    214.78x = 61,822.55
  5. Step 5: Solve for x
    x = 61,822.55/214.78
  6. Step 6: Final answer
    x = 287.84

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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.