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Finding the Fourth Proportional to 79.36, 109.48 and 55.86

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Solution

The fourth proportional to 79.36, 109.48 and 55.86 is: 77.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.36 : 109.48 = 55.86 : x
  2. Step 2: Convert to fraction form
    79.36/109.48 = 55.86/x
  3. Step 3: Cross multiply
    79.36x = 109.48 × 55.86
  4. Step 4: Simplify right side
    79.36x = 6,115.55
  5. Step 5: Solve for x
    x = 6,115.55/79.36
  6. Step 6: Final answer
    x = 77.06

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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.