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Finding the Fourth Proportional to 285.49, 427.92 and 139.18

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Solution

The fourth proportional to 285.49, 427.92 and 139.18 is: 208.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.49 : 427.92 = 139.18 : x
  2. Step 2: Convert to fraction form
    285.49/427.92 = 139.18/x
  3. Step 3: Cross multiply
    285.49x = 427.92 × 139.18
  4. Step 4: Simplify right side
    285.49x = 59,557.91
  5. Step 5: Solve for x
    x = 59,557.91/285.49
  6. Step 6: Final answer
    x = 208.62

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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.