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Finding the Fourth Proportional to 200.80, 276.78 and 145.46

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Solution

The fourth proportional to 200.80, 276.78 and 145.46 is: 200.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    200.80 : 276.78 = 145.46 : x
  2. Step 2: Convert to fraction form
    200.80/276.78 = 145.46/x
  3. Step 3: Cross multiply
    200.80x = 276.78 × 145.46
  4. Step 4: Simplify right side
    200.80x = 40,260.42
  5. Step 5: Solve for x
    x = 40,260.42/200.80
  6. Step 6: Final answer
    x = 200.50

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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.