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Finding the Fourth Proportional to 103.92, 156.50 and 90.56

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Solution

The fourth proportional to 103.92, 156.50 and 90.56 is: 136.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.92 : 156.50 = 90.56 : x
  2. Step 2: Convert to fraction form
    103.92/156.50 = 90.56/x
  3. Step 3: Cross multiply
    103.92x = 156.50 × 90.56
  4. Step 4: Simplify right side
    103.92x = 14,171.40
  5. Step 5: Solve for x
    x = 14,171.40/103.92
  6. Step 6: Final answer
    x = 136.37

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.