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Finding the Fourth Proportional to 104.28, 156.44 and 47.28

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Solution

The fourth proportional to 104.28, 156.44 and 47.28 is: 70.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.28 : 156.44 = 47.28 : x
  2. Step 2: Convert to fraction form
    104.28/156.44 = 47.28/x
  3. Step 3: Cross multiply
    104.28x = 156.44 × 47.28
  4. Step 4: Simplify right side
    104.28x = 7,396.48
  5. Step 5: Solve for x
    x = 7,396.48/104.28
  6. Step 6: Final answer
    x = 70.93

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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.