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Finding the Fourth Proportional to 79.60, 109.75 and 55.06

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Solution

The fourth proportional to 79.60, 109.75 and 55.06 is: 75.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.60 : 109.75 = 55.06 : x
  2. Step 2: Convert to fraction form
    79.60/109.75 = 55.06/x
  3. Step 3: Cross multiply
    79.60x = 109.75 × 55.06
  4. Step 4: Simplify right side
    79.60x = 6,042.84
  5. Step 5: Solve for x
    x = 6,042.84/79.60
  6. Step 6: Final answer
    x = 75.92

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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.