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Finding the Fourth Proportional to 79.45, 119.37 and 43.40

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Solution

The fourth proportional to 79.45, 119.37 and 43.40 is: 65.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.45 : 119.37 = 43.40 : x
  2. Step 2: Convert to fraction form
    79.45/119.37 = 43.40/x
  3. Step 3: Cross multiply
    79.45x = 119.37 × 43.40
  4. Step 4: Simplify right side
    79.45x = 5,181.12
  5. Step 5: Solve for x
    x = 5,181.12/79.45
  6. Step 6: Final answer
    x = 65.21

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.