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Finding the Fourth Proportional to 79.59, 109.75 and 54.68

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Solution

The fourth proportional to 79.59, 109.75 and 54.68 is: 75.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.59 : 109.75 = 54.68 : x
  2. Step 2: Convert to fraction form
    79.59/109.75 = 54.68/x
  3. Step 3: Cross multiply
    79.59x = 109.75 × 54.68
  4. Step 4: Simplify right side
    79.59x = 6,001.13
  5. Step 5: Solve for x
    x = 6,001.13/79.59
  6. Step 6: Final answer
    x = 75.40

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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.