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Finding the Fourth Proportional to 82.36, 123.80 and 66.31

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Solution

The fourth proportional to 82.36, 123.80 and 66.31 is: 99.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.36 : 123.80 = 66.31 : x
  2. Step 2: Convert to fraction form
    82.36/123.80 = 66.31/x
  3. Step 3: Cross multiply
    82.36x = 123.80 × 66.31
  4. Step 4: Simplify right side
    82.36x = 8,209.18
  5. Step 5: Solve for x
    x = 8,209.18/82.36
  6. Step 6: Final answer
    x = 99.67

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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.