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Finding the Fourth Proportional to 104.52, 156.53 and 81.51

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Solution

The fourth proportional to 104.52, 156.53 and 81.51 is: 122.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.52 : 156.53 = 81.51 : x
  2. Step 2: Convert to fraction form
    104.52/156.53 = 81.51/x
  3. Step 3: Cross multiply
    104.52x = 156.53 × 81.51
  4. Step 4: Simplify right side
    104.52x = 12,758.38
  5. Step 5: Solve for x
    x = 12,758.38/104.52
  6. Step 6: Final answer
    x = 122.06

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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.