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Finding the Fourth Proportional to 79.18, 109.21 and 70.27

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Solution

The fourth proportional to 79.18, 109.21 and 70.27 is: 96.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.18 : 109.21 = 70.27 : x
  2. Step 2: Convert to fraction form
    79.18/109.21 = 70.27/x
  3. Step 3: Cross multiply
    79.18x = 109.21 × 70.27
  4. Step 4: Simplify right side
    79.18x = 7,674.19
  5. Step 5: Solve for x
    x = 7,674.19/79.18
  6. Step 6: Final answer
    x = 96.92

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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.