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Finding the Fourth Proportional to 109.79, 164.51 and 55.58

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Solution

The fourth proportional to 109.79, 164.51 and 55.58 is: 83.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.79 : 164.51 = 55.58 : x
  2. Step 2: Convert to fraction form
    109.79/164.51 = 55.58/x
  3. Step 3: Cross multiply
    109.79x = 164.51 × 55.58
  4. Step 4: Simplify right side
    109.79x = 9,143.19
  5. Step 5: Solve for x
    x = 9,143.19/109.79
  6. Step 6: Final answer
    x = 83.28

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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.