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Finding the Fourth Proportional to 285.13, 427.62 and 122.80

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Solution

The fourth proportional to 285.13, 427.62 and 122.80 is: 184.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.13 : 427.62 = 122.80 : x
  2. Step 2: Convert to fraction form
    285.13/427.62 = 122.80/x
  3. Step 3: Cross multiply
    285.13x = 427.62 × 122.80
  4. Step 4: Simplify right side
    285.13x = 52,511.74
  5. Step 5: Solve for x
    x = 52,511.74/285.13
  6. Step 6: Final answer
    x = 184.17

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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.