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Finding the Fourth Proportional to 82.22, 113.74 and 71.60

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Solution

The fourth proportional to 82.22, 113.74 and 71.60 is: 99.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.22 : 113.74 = 71.60 : x
  2. Step 2: Convert to fraction form
    82.22/113.74 = 71.60/x
  3. Step 3: Cross multiply
    82.22x = 113.74 × 71.60
  4. Step 4: Simplify right side
    82.22x = 8,143.78
  5. Step 5: Solve for x
    x = 8,143.78/82.22
  6. Step 6: Final answer
    x = 99.05

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.