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Finding the Fourth Proportional to 79.71, 109.95 and 55.17

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Solution

The fourth proportional to 79.71, 109.95 and 55.17 is: 76.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.71 : 109.95 = 55.17 : x
  2. Step 2: Convert to fraction form
    79.71/109.95 = 55.17/x
  3. Step 3: Cross multiply
    79.71x = 109.95 × 55.17
  4. Step 4: Simplify right side
    79.71x = 6,065.94
  5. Step 5: Solve for x
    x = 6,065.94/79.71
  6. Step 6: Final answer
    x = 76.10

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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.