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Finding the Fourth Proportional to 79.68, 119.70 and 56.94

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Solution

The fourth proportional to 79.68, 119.70 and 56.94 is: 85.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.68 : 119.70 = 56.94 : x
  2. Step 2: Convert to fraction form
    79.68/119.70 = 56.94/x
  3. Step 3: Cross multiply
    79.68x = 119.70 × 56.94
  4. Step 4: Simplify right side
    79.68x = 6,815.72
  5. Step 5: Solve for x
    x = 6,815.72/79.68
  6. Step 6: Final answer
    x = 85.54

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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.