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Finding the Fourth Proportional to 200.35, 300.39 and 78.55

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Solution

The fourth proportional to 200.35, 300.39 and 78.55 is: 117.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    200.35 : 300.39 = 78.55 : x
  2. Step 2: Convert to fraction form
    200.35/300.39 = 78.55/x
  3. Step 3: Cross multiply
    200.35x = 300.39 × 78.55
  4. Step 4: Simplify right side
    200.35x = 23,595.63
  5. Step 5: Solve for x
    x = 23,595.63/200.35
  6. Step 6: Final answer
    x = 117.77

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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.