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Finding the Fourth Proportional to 156.44, 215.94 and 104.78

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Solution

The fourth proportional to 156.44, 215.94 and 104.78 is: 144.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.44 : 215.94 = 104.78 : x
  2. Step 2: Convert to fraction form
    156.44/215.94 = 104.78/x
  3. Step 3: Cross multiply
    156.44x = 215.94 × 104.78
  4. Step 4: Simplify right side
    156.44x = 22,626.19
  5. Step 5: Solve for x
    x = 22,626.19/156.44
  6. Step 6: Final answer
    x = 144.63

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.