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Finding the Fourth Proportional to 109.10, 163.57 and 51.29

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Solution

The fourth proportional to 109.10, 163.57 and 51.29 is: 76.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.10 : 163.57 = 51.29 : x
  2. Step 2: Convert to fraction form
    109.10/163.57 = 51.29/x
  3. Step 3: Cross multiply
    109.10x = 163.57 × 51.29
  4. Step 4: Simplify right side
    109.10x = 8,389.51
  5. Step 5: Solve for x
    x = 8,389.51/109.10
  6. Step 6: Final answer
    x = 76.90

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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.