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Finding the Fourth Proportional to 79.18, 109.22 and 55.87

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Solution

The fourth proportional to 79.18, 109.22 and 55.87 is: 77.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.18 : 109.22 = 55.87 : x
  2. Step 2: Convert to fraction form
    79.18/109.22 = 55.87/x
  3. Step 3: Cross multiply
    79.18x = 109.22 × 55.87
  4. Step 4: Simplify right side
    79.18x = 6,101.57
  5. Step 5: Solve for x
    x = 6,101.57/79.18
  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.