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Finding the Fourth Proportional to 200.91, 277.16 and 138.65

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Solution

The fourth proportional to 200.91, 277.16 and 138.65 is: 191.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    200.91 : 277.16 = 138.65 : x
  2. Step 2: Convert to fraction form
    200.91/277.16 = 138.65/x
  3. Step 3: Cross multiply
    200.91x = 277.16 × 138.65
  4. Step 4: Simplify right side
    200.91x = 38,426.15
  5. Step 5: Solve for x
    x = 38,426.15/200.91
  6. Step 6: Final answer
    x = 191.26

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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.