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Finding the Fourth Proportional to 135.28, 186.66 and 79.25

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Solution

The fourth proportional to 135.28, 186.66 and 79.25 is: 109.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    135.28 : 186.66 = 79.25 : x
  2. Step 2: Convert to fraction form
    135.28/186.66 = 79.25/x
  3. Step 3: Cross multiply
    135.28x = 186.66 × 79.25
  4. Step 4: Simplify right side
    135.28x = 14,792.81
  5. Step 5: Solve for x
    x = 14,792.81/135.28
  6. Step 6: Final answer
    x = 109.35

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.