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Finding the Fourth Proportional to 200.80, 277.10 and 130.90

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Solution

The fourth proportional to 200.80, 277.10 and 130.90 is: 180.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    200.80 : 277.10 = 130.90 : x
  2. Step 2: Convert to fraction form
    200.80/277.10 = 130.90/x
  3. Step 3: Cross multiply
    200.80x = 277.10 × 130.90
  4. Step 4: Simplify right side
    200.80x = 36,272.79
  5. Step 5: Solve for x
    x = 36,272.79/200.80
  6. Step 6: Final answer
    x = 180.65

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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.