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Finding the Fourth Proportional to 200.78, 299.90 and 160.08

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Solution

The fourth proportional to 200.78, 299.90 and 160.08 is: 239.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    200.78 : 299.90 = 160.08 : x
  2. Step 2: Convert to fraction form
    200.78/299.90 = 160.08/x
  3. Step 3: Cross multiply
    200.78x = 299.90 × 160.08
  4. Step 4: Simplify right side
    200.78x = 48,007.19
  5. Step 5: Solve for x
    x = 48,007.19/200.78
  6. Step 6: Final answer
    x = 239.11

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.