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Finding the Fourth Proportional to 214.79, 322.29 and 137.78

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Solution

The fourth proportional to 214.79, 322.29 and 137.78 is: 206.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    214.79 : 322.29 = 137.78 : x
  2. Step 2: Convert to fraction form
    214.79/322.29 = 137.78/x
  3. Step 3: Cross multiply
    214.79x = 322.29 × 137.78
  4. Step 4: Simplify right side
    214.79x = 44,405.12
  5. Step 5: Solve for x
    x = 44,405.12/214.79
  6. Step 6: Final answer
    x = 206.74

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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.