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Finding the Fourth Proportional to 109.55, 163.11 and 102.87

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Solution

The fourth proportional to 109.55, 163.11 and 102.87 is: 153.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.55 : 163.11 = 102.87 : x
  2. Step 2: Convert to fraction form
    109.55/163.11 = 102.87/x
  3. Step 3: Cross multiply
    109.55x = 163.11 × 102.87
  4. Step 4: Simplify right side
    109.55x = 16,779.51
  5. Step 5: Solve for x
    x = 16,779.51/109.55
  6. Step 6: Final answer
    x = 153.16

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.