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Finding the Fourth Proportional to 147.65, 203.72 and 82.15

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Solution

The fourth proportional to 147.65, 203.72 and 82.15 is: 113.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    147.65 : 203.72 = 82.15 : x
  2. Step 2: Convert to fraction form
    147.65/203.72 = 82.15/x
  3. Step 3: Cross multiply
    147.65x = 203.72 × 82.15
  4. Step 4: Simplify right side
    147.65x = 16,735.80
  5. Step 5: Solve for x
    x = 16,735.80/147.65
  6. Step 6: Final answer
    x = 113.35

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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.