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Finding the Fourth Proportional to 285.22, 427.40 and 208.34

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Solution

The fourth proportional to 285.22, 427.40 and 208.34 is: 312.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.22 : 427.40 = 208.34 : x
  2. Step 2: Convert to fraction form
    285.22/427.40 = 208.34/x
  3. Step 3: Cross multiply
    285.22x = 427.40 × 208.34
  4. Step 4: Simplify right side
    285.22x = 89,044.52
  5. Step 5: Solve for x
    x = 89,044.52/285.22
  6. Step 6: Final answer
    x = 312.20

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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.