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Finding the Fourth Proportional to 203.16, 280.32 and 137.64

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Solution

The fourth proportional to 203.16, 280.32 and 137.64 is: 189.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    203.16 : 280.32 = 137.64 : x
  2. Step 2: Convert to fraction form
    203.16/280.32 = 137.64/x
  3. Step 3: Cross multiply
    203.16x = 280.32 × 137.64
  4. Step 4: Simplify right side
    203.16x = 38,583.24
  5. Step 5: Solve for x
    x = 38,583.24/203.16
  6. Step 6: Final answer
    x = 189.92

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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.