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Finding the Fourth Proportional to 79.49, 109.03 and 69.77

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Solution

The fourth proportional to 79.49, 109.03 and 69.77 is: 95.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.49 : 109.03 = 69.77 : x
  2. Step 2: Convert to fraction form
    79.49/109.03 = 69.77/x
  3. Step 3: Cross multiply
    79.49x = 109.03 × 69.77
  4. Step 4: Simplify right side
    79.49x = 7,607.02
  5. Step 5: Solve for x
    x = 7,607.02/79.49
  6. Step 6: Final answer
    x = 95.70

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.