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Finding the Fourth Proportional to 283.20, 390.24 and 200.40

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Solution

The fourth proportional to 283.20, 390.24 and 200.40 is: 276.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    283.20 : 390.24 = 200.40 : x
  2. Step 2: Convert to fraction form
    283.20/390.24 = 200.40/x
  3. Step 3: Cross multiply
    283.20x = 390.24 × 200.40
  4. Step 4: Simplify right side
    283.20x = 78,204.10
  5. Step 5: Solve for x
    x = 78,204.10/283.20
  6. Step 6: Final answer
    x = 276.14

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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.