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Finding the Fourth Proportional to 82.09, 123.63 and 72.58

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Solution

The fourth proportional to 82.09, 123.63 and 72.58 is: 109.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.09 : 123.63 = 72.58 : x
  2. Step 2: Convert to fraction form
    82.09/123.63 = 72.58/x
  3. Step 3: Cross multiply
    82.09x = 123.63 × 72.58
  4. Step 4: Simplify right side
    82.09x = 8,972.08
  5. Step 5: Solve for x
    x = 8,972.08/82.09
  6. Step 6: Final answer
    x = 109.30

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.