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Finding the Fourth Proportional to 164.20, 245.76 and 109.40

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Solution

The fourth proportional to 164.20, 245.76 and 109.40 is: 163.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    164.20 : 245.76 = 109.40 : x
  2. Step 2: Convert to fraction form
    164.20/245.76 = 109.40/x
  3. Step 3: Cross multiply
    164.20x = 245.76 × 109.40
  4. Step 4: Simplify right side
    164.20x = 26,886.14
  5. Step 5: Solve for x
    x = 26,886.14/164.20
  6. Step 6: Final answer
    x = 163.74

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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.