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Finding the Fourth Proportional to 200.40, 280.20 and 200.40

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Solution

The fourth proportional to 200.40, 280.20 and 200.40 is: 280.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    200.40 : 280.20 = 200.40 : x
  2. Step 2: Convert to fraction form
    200.40/280.20 = 200.40/x
  3. Step 3: Cross multiply
    200.40x = 280.20 × 200.40
  4. Step 4: Simplify right side
    200.40x = 56,152.08
  5. Step 5: Solve for x
    x = 56,152.08/200.40
  6. Step 6: Final answer
    x = 280.20

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.