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Finding the Fourth Proportional to 82.50, 124.22 and 72.46

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Solution

The fourth proportional to 82.50, 124.22 and 72.46 is: 109.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.50 : 124.22 = 72.46 : x
  2. Step 2: Convert to fraction form
    82.50/124.22 = 72.46/x
  3. Step 3: Cross multiply
    82.50x = 124.22 × 72.46
  4. Step 4: Simplify right side
    82.50x = 9,000.98
  5. Step 5: Solve for x
    x = 9,000.98/82.50
  6. Step 6: Final answer
    x = 109.10

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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.