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Finding the Fourth Proportional to 214.72, 322.12 and 86.48

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Solution

The fourth proportional to 214.72, 322.12 and 86.48 is: 129.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    214.72 : 322.12 = 86.48 : x
  2. Step 2: Convert to fraction form
    214.72/322.12 = 86.48/x
  3. Step 3: Cross multiply
    214.72x = 322.12 × 86.48
  4. Step 4: Simplify right side
    214.72x = 27,856.94
  5. Step 5: Solve for x
    x = 27,856.94/214.72
  6. Step 6: Final answer
    x = 129.74

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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.