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Finding the Fourth Proportional to 200.43, 300.75 and 78.69

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Solution

The fourth proportional to 200.43, 300.75 and 78.69 is: 118.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    200.43 : 300.75 = 78.69 : x
  2. Step 2: Convert to fraction form
    200.43/300.75 = 78.69/x
  3. Step 3: Cross multiply
    200.43x = 300.75 × 78.69
  4. Step 4: Simplify right side
    200.43x = 23,666.02
  5. Step 5: Solve for x
    x = 23,666.02/200.43
  6. Step 6: Final answer
    x = 118.08

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.