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Finding the Fourth Proportional to 82.04, 122.34 and 78.76

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Solution

The fourth proportional to 82.04, 122.34 and 78.76 is: 117.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.04 : 122.34 = 78.76 : x
  2. Step 2: Convert to fraction form
    82.04/122.34 = 78.76/x
  3. Step 3: Cross multiply
    82.04x = 122.34 × 78.76
  4. Step 4: Simplify right side
    82.04x = 9,635.50
  5. Step 5: Solve for x
    x = 9,635.50/82.04
  6. Step 6: Final answer
    x = 117.45

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.