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Finding the Fourth Proportional to 82.04, 122.70 and 79.40

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Solution

The fourth proportional to 82.04, 122.70 and 79.40 is: 118.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.04 : 122.70 = 79.40 : x
  2. Step 2: Convert to fraction form
    82.04/122.70 = 79.40/x
  3. Step 3: Cross multiply
    82.04x = 122.70 × 79.40
  4. Step 4: Simplify right side
    82.04x = 9,742.38
  5. Step 5: Solve for x
    x = 9,742.38/82.04
  6. Step 6: Final answer
    x = 118.75

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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.