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Finding the Fourth Proportional to 104.57, 156.78 and 53.21

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Solution

The fourth proportional to 104.57, 156.78 and 53.21 is: 79.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.57 : 156.78 = 53.21 : x
  2. Step 2: Convert to fraction form
    104.57/156.78 = 53.21/x
  3. Step 3: Cross multiply
    104.57x = 156.78 × 53.21
  4. Step 4: Simplify right side
    104.57x = 8,342.26
  5. Step 5: Solve for x
    x = 8,342.26/104.57
  6. Step 6: Final answer
    x = 79.78

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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.