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Finding the Fourth Proportional to 285.13, 427.78 and 156.97

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Solution

The fourth proportional to 285.13, 427.78 and 156.97 is: 235.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.13 : 427.78 = 156.97 : x
  2. Step 2: Convert to fraction form
    285.13/427.78 = 156.97/x
  3. Step 3: Cross multiply
    285.13x = 427.78 × 156.97
  4. Step 4: Simplify right side
    285.13x = 67,146.49
  5. Step 5: Solve for x
    x = 67,146.49/285.13
  6. Step 6: Final answer
    x = 235.50

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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.